Merge pull request #49 from hashd/master

Merged changes from ksnov featuring Banner on library dist files
Added config for tooltip format.

Added utility method to use specified tooltip format using %c, %l and %v.
Merge branch 'master' of github.com:Imaginea/uvCharts
Merge pull request #50 from priyankadudani/master

Added configuration option for tooltip text format.
Added opacity for axis lines
Added strokecolor and width for pie and donut as default in config.js