Add doxygen checker (#1540)

* Fixed Doxygen issues
 * Updated Doxygen config
 * Added new script to test whether doxygen generation was successful or not
 * Added to Travis CI

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

Doxyfile

@@ -76,7 +76,7 @@ CREATE_SUBDIRS         = NO
 # U+3044.
 # The default value is: NO.
 
-ALLOW_UNICODE_NAMES    = NO
+# ALLOW_UNICODE_NAMES    = NO
 
 # The OUTPUT_LANGUAGE tag is used to specify the language in which all
 # documentation generated by doxygen is written. Doxygen will use this
@@ -512,7 +512,7 @@ HIDE_SCOPE_NAMES       = NO
 # YES the compound reference will be hidden.
 # The default value is: NO.
 
-HIDE_COMPOUND_REFERENCE= NO
+# HIDE_COMPOUND_REFERENCE= NO
 
 # If the SHOW_INCLUDE_FILES tag is set to YES then doxygen will put a list of
 # the files that are included by a file in the documentation of that file.
@@ -730,7 +730,7 @@ WARN_IF_DOC_ERROR      = YES
 # parameter documentation, but not about the absence of documentation.
 # The default value is: NO.
 
-WARN_NO_PARAMDOC       = NO
+WARN_NO_PARAMDOC       = YES
 
 # The WARN_FORMAT tag determines the format of the warning messages that doxygen
 # can produce. The string should contain the $file, $line, and $text tags, which
@@ -778,7 +778,7 @@ INPUT_ENCODING         = UTF-8
 # *.md, *.mm, *.dox, *.py, *.f90, *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf,
 # *.qsf, *.as and *.js.
 
-FILE_PATTERNS          =
+FILE_PATTERNS          = *.h, *.c
 
 # The RECURSIVE tag can be used to specify whether or not subdirectories should
 # be searched for input files as well.
@@ -991,7 +991,7 @@ VERBATIM_HEADERS       = YES
 # compiled with the --with-libclang option.
 # The default value is: NO.
 
-CLANG_ASSISTED_PARSING = NO
+# CLANG_ASSISTED_PARSING = NO
 
 # If clang assisted parsing is enabled you can provide the compiler with command
 # line options that you would normally use when invoking the compiler. Note that
@@ -999,7 +999,7 @@ CLANG_ASSISTED_PARSING = NO
 # specified with INPUT and INCLUDE_PATH.
 # This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES.
 
-CLANG_OPTIONS          =
+# CLANG_OPTIONS          =
 
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index
@@ -1668,7 +1668,7 @@ LATEX_FOOTER           =
 # list).
 # This tag requires that the tag GENERATE_LATEX is set to YES.
 
-LATEX_EXTRA_STYLESHEET =
+# LATEX_EXTRA_STYLESHEET =
 
 # The LATEX_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the LATEX_OUTPUT output
@@ -1793,7 +1793,7 @@ RTF_EXTENSIONS_FILE    =
 # The default value is: NO.
 # This tag requires that the tag GENERATE_RTF is set to YES.
 
-RTF_SOURCE_CODE        = NO
+# RTF_SOURCE_CODE        = NO
 
 #---------------------------------------------------------------------------
 # Configuration options related to the man page output
@@ -1828,7 +1828,7 @@ MAN_EXTENSION          = .3
 # MAN_EXTENSION with the initial . removed.
 # This tag requires that the tag GENERATE_MAN is set to YES.
 
-MAN_SUBDIR             =
+# MAN_SUBDIR             =
 
 # If the MAN_LINKS tag is set to YES and doxygen generates man output, then it
 # will generate one additional man file for each entity documented in the real
@@ -1891,7 +1891,7 @@ DOCBOOK_OUTPUT         = docbook
 # The default value is: NO.
 # This tag requires that the tag GENERATE_DOCBOOK is set to YES.
 
-DOCBOOK_PROGRAMLISTING = NO
+# DOCBOOK_PROGRAMLISTING = NO
 
 #---------------------------------------------------------------------------
 # Configuration options for the AutoGen Definitions output
@@ -2316,12 +2316,12 @@ DIAFILE_DIRS           =
 # generate a warning when it encounters a \startuml command in this case and
 # will not generate output for the diagram.
 
-PLANTUML_JAR_PATH      =
+# PLANTUML_JAR_PATH      =
 
 # When using plantuml, the specified paths are searched for files specified by
 # the !include statement in a plantuml block.
 
-PLANTUML_INCLUDE_PATH  =
+# PLANTUML_INCLUDE_PATH  =
 
 # The DOT_GRAPH_MAX_NODES tag can be used to set the maximum number of nodes
 # that will be shown in the graph. If the number of nodes in a graph becomes