base implementation of pythresh
New branch 2-feature-wfshore-workflow ref #2

Starting with the tile_file_utils.py from bonaparte, the aim is to:

- accomplish WFShoreTS and WFShoreStats in one efficient step.

1. Gridding each receptor from the tie file
2. Process each TR3 for shore oil mass
3. Find the maximum shore mass for each grid in each receptor
4. Report the maximum oil mass in a digestable format for tables

As the table required both probability and shoreline data this may
need to be integrated into a full StochasticThreshold solution.
new central module tie.py
update .gitignore to ignore .html files built by cython
start banks grids module
port grid functions from pythresh
add SOUTHERN_HEMISPHERE flag, must fix
update .gitignore on sublime-workspace files
Merge branch '2-feature-wfshore-workflow'