Merge pull request #18 from spmason/more-granular-updates

tabler.update now does partial updates on the cell level
v0.10.12
Update README.md

Travis badge now only shows status of master branch
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 pkugin 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