Zepto 1.1.6 w/ mods for JSPM consumption.

This is Zepto 1.1.6 with the following mods for module consumption: added JSPM overrides in package.json, removed dist/ exclusion in .gitignore, built Zepto w/ following modules: umd-head zepto event ajax form ie data fx_methods fx touch polyfill-jquery umd-tail. Added UMD wrapper for module consumption.