Add support for eco.py region-based itree codes

Previously you could only specify a single itree code, such as 'BEM
OTHER'. Now you can provide a list of regions and codes such as:
'InlEmpSEA:BEM OTHER,TrpInWBOI: PEL OTHER' and the tree's location will
be used to determine the region
Windows line endings are screwy

Use 'universal line ending' mode.
Include underscore on the status page
Add total eco benefits to status page

Note that the feeds function returns an 'eco' key which is
thunk. Evaluate it at your own peril to get the total eco benefits for
the instance.
Use a valid default itree region
Fixup broken tests
Merge pull request #165 from ahinz/topic/la

Topic/la