Removed ununsed import
Creating the new layers applier class based on a priority queue
Trying to get the layers applier replacemnt to work
Changed the way replace_all works, so that it works smoothly with html
Added some more testing
All layers are now designed to behave like searchandreplace layers. Also, search and replace is HTML aware.
Previous methods are now static - reflected this change
Fixed test due to changes in how we build in layers
Merge branch 'master' of github.com:eregs/regulations-site
Added lxml to the requirements file
Added paragraph marker layer back in
Merge pull request #69 from khandelwal/master

Fixes #63, #47, #36