🚀 Merges and goals

[brianmhunt]

Phase 1 - merges

• [x] knockout/knockout#1868 - Gulp
• [x] knockout/knockout#1880 - 1880 template html parser
• [x] knockout/knockout#1833 - Add contributor agreement for contributors
• [x] knockout/knockout#1820 - Implement a jscs/eslint code linter + strategy
• [x] knockout/knockout#1628 - Add hook for ko.onBindingError
• [x] knockout/knockout#1602 - Stateful binding handlers

Phase 2 - equivalency

• [x] knockout/knockout#1369 (knockout/knockout#1691) - Update export mechanism (to support a switch from Closure Compiler to UglifyJS)
• [x] Build mechanism (rollup)
• [x] importification + tests for
  • [x] tko.utils
  • [x] tko.observable
  • [x] tko.computed
  • [x] tko.provider
  • [x] tko.bind
  • [x] tko.binding.core
  • [x] tko.binding.template
  • [x] tko.binding.if
  • [x] tko.filter.punches
  • [x] tko.components
• [x] Compile the above to make a working version of tko

Phase 3 - Toolset and Additions

• [x] The TKO Policy knockout/tko-policy#1
• [x] Testing with Jasmine, Mocha, others
• [ ] Document needed polyfills
• [ ] knockout/knockout#1827 Generated documentation/website
• [ ] knockout/knockout#1589 Plugin architecture
• [ ] Incorporate key plugins
  • [x] FastForeach
  • [x] if/else
    • [x] <!-- else --> inside conditional bindings
    • [x] expose conditionals for successive bindings
    • [x] else + elseif binding
  • [ ] postprocess binding
  • [x] Knockout Secure Binding
  • [x] Punches
    • [x] filters
    • [x] interpolation
    • [x] namespacing
  • [x] BindingHandler
    • [x] .makeBindingHandler(fn)
    • [ ] Promise/resolution of valueAccessor
  • [ ] Extender / Promises (cast-Read/Write; thenable; resolveOnRead/Write; .when/.next/…)
  • [ ] Postbox
  • [ ] ES6 Map/WeakMap