0.8.1

enhancement - Added repeat pipe for strings
enhancement - Added interpolate pipe for strings
enhancement - Added truncate pipe for strings
enhancement - Added floor pipe for numbers
enhancement - Added ceil pipe for numbers
Added support for testing on Edge Headless browser
Added npm script command 'test'
Made default separator constants private in multiple pipes (breaking)

Corrected documentation of 'map' array pipe
Refactored spec name 'should create an instance'
documentation, enhancement - round pipe spec