Added basic perf test for instantiation
Improved regular tabler instantiation performance by optimising validateSpec and making it also addToSpec too
Sped up removeColumns and columnGrouper plugins
Optimised tabler plugin attachment and detachment

By stripping out use of underscore methods
Use on instead of delegate for jQuery event subs

delegate just calls on, so we save one function call
Rewrote performance tests

They now time over X iterations and average the result
Merge pull request #19 from spmason/performance

Performance Improvements