Store exceptions raised by ``abort`` in the WSGI environ.

This makes it easier to access the original exception later in the request cycle (e.g., other middleware or in custom error handlers).
Merge pull request #206 from ryanpetrello/next

Store exceptions raised by ``abort`` in the WSGI environ.
Resolve a bug in TransactionHook.

This commit makes TransactionHook more robust so that it isn't as susceptible
to failure when exceptions occur in *other* PecanHooks within a request.
Improve performance for general pecan request handling.
Merge pull request #207 from ryanpetrello/next

Resolve a bug in TransactionHook.
More pecan optimizations.
More tinkering on performant Accept method handling.
Rearrange quickstart verbiage so users don't miss a necessary step.
Merge pull request #210 from ryanpetrello/next

Rearrange quickstart verbiage so users don't miss a necessary step.
Merge pull request #208 from ryanpetrello/perf

Improve performance for general pecan request handling.
Remove some unnecessary cruft and improve test coverage for core.py
Add coverage configuration.
Merge branch 'next' of github.com:dreamhost/pecan into next

Conflicts:
	pecan/core.py
Merge pull request #211 from ryanpetrello/next

Remove some unnecessary cruft and improve test coverage for core.py
os.environ test clean-up and reorder overwrite

fixes issue 197
add comment explaining why the code was reordered
Merge pull request #200 from markmcclain/env_fix

Env fix
Merge branch 'master' into next
Version increment.
Merge branch 'next', remote-tracking branch 'origin'