Ionic Cache Versions Save

New version with lots of fixes. Big thanks to ihadeed for this release!

Breaking changes:

• Renamed disableCachemethod to enableCache

Changes and bug fixes:

• use Ionic Storage so now IndexedDB, SQLite, WebSQL are supported in this order
• removed dependencies, made everything a dev dependency to make things simpler
• added NgModule ( closes #25 )
• added .editorconfig file
• removed typings and added @types
• compiling with ngc instead of tsc to produce needed files for AoT compilation
• added tests
• fix linting
• add circleci instructions
• error are now passed throught observable chain when using loadFromDelayedObservable ( closes #24 )

Request with apostrophe in data now working.

Dropped out all Ionic libraries dependency.

Key features:

• Request caching
• Delayed observable caching (see docs for more info)
• Don't invalidate cache if is browser offline
• Set and invalidate groups of entries