Merge pull request #98 from danbell/master

Check environment variable LOG4JS_CONFIG for configuration file location.
Version 0.5.4
fix for issue #100, multiprocess appender and logLevelFilter don't play nicely
[feature] Add color option to pattern layout.
Based on #90 this implements the possibillity to add the color codes
according to the log level via %[ and %].
Merge pull request #101 from Dignifiedquire/feature-color-pattern

[feature] Add patternColoured Layout.
New version, with colours in pattern layout
Added syntax highlighting to JS code in README.md
Merge pull request #105 from ulikoehler/readme-syntax-highlighting

Added syntax highlighting to JS code in README.md
Changed layouts to use util.format instead of my own implementation
Misc code highlighting fixes in readme.md
Move examples into their own directory.
Merge pull request #109 from Dignifiedquire/fix-1

Misc code highlighting fixes in readme.md
Merge pull request #110 from Dignifiedquire/fix-2

Move examples into their own directory.
add your own tokens to the patternLayout
added some documentation to the function header
fixed small issue that could occur with wrong evaluated parameters
added example on pattern tokens usage
updated require in example to match other examles
added some test output files to gitignore
Merge pull request #113 from bitcloud/patternLayout_tokens

add your own tokens to the patternLayout