Set background color for Smarty identifier

Fixes #59
Added .gitignore
Add ”Language Defaults” colors

The .icls (Idea CoLor Scheme) format introduced in IntelliJ IDEA 12.1
uses this set of standard text attributes.
See http://confluence.jetbrains.com/x/rMDyAg
Remove all empty option elements

Cleaned up the XML files by removing all <option>
elements without a value attribute.
Rename files to ”.icls”

The color scheme files now include ”Language Defaults”
settings so the file names are changed to use the new ”.icls” suffix.
The ”buildjar.sh” and ”buildjar.bat” scripts are updated to
copy the files to versions named ”.xml” to maintain backwards
compatibility with IntelliJ IDEA versions prior to 12.1.
Change IntelliJ IDEA version reference in README.md
Merge branch 'icls'

Fixes #58
Update settings.jar after merge