Added initial javascript scanner

It's based on python scanner. The scanner is added to the build process
and integrates it in the xgettext utility.
It builds successful. And it's successful tested against a huge javascript
application code base.
formatstring_javascript for libgettextpo, woe32dll

 * libgettextpo was missing the symbol, woe32dll didn't define it either
Merge branch 'master' into javascript
New test case for JavaScript xgettext backend
More JavaScript test cases expected to fail until fixed
New JavaScript test cases enabled in build system

xgettext-javascript-[1-3] added
Adding JavaScript to command line help message

Help for --language argument enhanced with JavaScript language
Added support for RegExp literals in JavaScript code
Added support for concatenation of JavaScript strings

As it's usual to concatenate JavaScript string literals using the
plus '+' operator this should be also supported.
Division operator detection after right parent
JavaScript xgettext: Fixed wrong phase for RegExp literal

Changed phase3 to phase2 as phase3 would identify comments within RegExp
literals.
Division operator detection after right bracket
Merge branch 'master' into javascript
Merge branch 'javascript' of github.com:AndyStricker/gettext-javascript into javascript
Merge branch 'master' into javascript
Added initial javascript scanner

It's based on python scanner. The scanner is added to the build process
and integrates it in the xgettext utility.
It builds successful. And it's successful tested against a huge javascript
application code base.
formatstring_javascript for libgettextpo, woe32dll

 * libgettextpo was missing the symbol, woe32dll didn't define it either
New test case for JavaScript xgettext backend
More JavaScript test cases expected to fail until fixed
New JavaScript test cases enabled in build system

xgettext-javascript-[1-3] added