Performance Upgrade to _slice

According to http://jsperf.com/arguments-to-array/5, instantiating an
Array with a known lenght is more performant.
Error Correction of _slice
Updated definition of length in _slice
Corrected args to arr in _slice
Corrected length definition in _slice
Finally corrected _slice bug
Added length var
Added semicolon
Simplify append function
simplify splice
Merge pull request #70 from cgarciae/master

Speed improvement to _slice
Merge pull request #71 from megawac/simplify-append

Simplify append function
Merge pull request #75 from megawac/splice

simplify splice
Use a wrapper for allPredicates and anyPredicates
predicateWrap: Slight optimization and improved comments
Alias groupBy as partition
Merge pull request #79 from megawac/groupBy

Alias groupBy as partition
ramda logo outline
zip fix for shortest length
remove bench dir for now