Use lazyeval for NSE
Add lazyeval to travis install instructions
Modify grammar of the vignette
Use `<-` for assignment in vignette
Change all assignments to `->`
Olaf is headed the wrong way!

Shows you how often I use `<-`, couldn't even get it in the right
direction :)
Remove start_with and end_with

This is necessary to fix #7 - using those methods with n_times
Add any_of,any_except,between functions

Also move some functions to utils.R
Move escape code to their own file
Tests for any_except
regex should be exported
Add missing files

Better chance of things working then
Create prefix or function