Support less 2.0.0 to 2.5.0

[WalkerCodeRanger]

Please add the option of selecting less versions:

• 2.0.0
• 2.1.0
• 2.1.1
• 2.1.2
• 2.2.0
• 2.3.0
• 2.3.1
• 2.4.0
• 2.5.0

[lukeapage]

I've forked and am re-writing. You can use this..
http://lesscss.org/less-preview/