Fixing newline character for text files

This addressed an issue where the newlines generated when including snippet files does not contain newline characters, this causes SnippetManager.parseSnippetFile to always return empty.

Instead, of creating actual newlines and a multiline string with \, this adds newline characters.
Add Velocity highlighter
Fixed matching of single line comments
Added velocity mode and sample doc to demo
Added comment settings to add comment shortcut (ctrl+/)
Slight adjustment to the newline fix

I also had to remove this line to get things to work.
fix php worker bogus error on use keyword
Merge pull request #1354 from machee/master

fix php worker bogus error on use keyword
Merge pull request #1351 from rgriffith/velocity_mode

Add Velocity highlighter
Merge pull request #1350 from rgriffith/snippet_newline_fix

Fix newlines for text files
remove whitespace from css during the build
Based Dart mode on C/C++ mode so that at least the indentation basics
are acceptable (e.g. indentation after curly braces).
Fixed some higlighting rules to match modern Dart.
of keyword
Fix Dart test
Removed outdated keywords
Merge pull request #1358 from ajaxorg/dart-based-on-c

Based Dart mode on C/C++ mode so that at least the indentation basics
remove not necessary/worng comments and not tcl specific rule for variables (is only valid for the tcl extension xotcl
Merge pull request #1360 from chhochreiner/master

minor tcl mode cleanup