docs(formatter): improvements to currency, date, filter, and formatter library
docs: edit formatter docs
docs(formatter): fix "leading" in currency and edits to limit_to
docs(formatter): fix and edit per comments on 0e0f8d6

Closes #1036
fix(VmTurnZone): Remove a unneeded delegate.run() call.
chore(analyzer): Do not display hints for Travis
docs(directive): edit directive class definitions
refactor(DecoratorFormatter): Fix a bad rename. DecoratorFormatter is now DirectiveModule
docs(directive): fix whitespace and a missed rename from 0e0f8d6
docs(InputDateLike): Improve and edit the class description
docs(NgTrueValue): Edits for dartdoc style.
docs(NgFalseValue): Edits for dartdoc style.
docs(ng-model): Fix typos and style
docs(ng-bind): Edits for dartdoc format
docs(NgModelConverter): Edits for style.
docs(directives): edits to directive docs
docs(orderBy): fix a small typo
docs(directives): Edit for dartstyle and clarity.

Closes #1037
docs: wordsmithed module definitions for the top-level lib docs
perf(interpolate): 20%. Cache the interpolated expressions.