Add option to skip pre compilation on developmentMode

When `developmentMode` set to `true`, instead of precompiling the template
with hanlebars.js, just wrap the template with `Ember.Handlebars.compile`
Add `developmentMode` option in README
Rename the option `developmentMode` => `precompile`
Minor tweaks related to new `precompile` option
ember-template-compiler.js v1.0.0
v0.4.13