Renamed parseHex fn to more descriptive parseIntFromHex
Added support for ARGB hex-8
Slight refactor
Refactor toFilter() to use toHex8String() and rgbaToHex()
Slight refactor
Added checks for toHex8String and toHex8 methods to the 'Hex Parsing' test
Added toHex8()/toHex8String() to index.html
README.md - added information about 8-digit hex functionality
add hex8 to test suite.  Issue 22
add hex8 to test suite.  Issue 22
Merge branch 'master' into gh-pages