TST: clean up noise emitted when running test suite.
TST: clean up warnings generated by Stata reader test.
Merge pull request #590 from rgommers/cleanup-test-output

Cleanup test output
MAINT: in setup.py, only catch ImportError for pandas.

See for example gh-617.
Merge pull request #621 from rgommers/setuppy-importerror

MAINT: in setup.py, only catch ImportError for pandas.
Added starting values for confidence intervals.  Shaved off about 40s.
Editied Limits, marked Powell tests as slow.  See comment in Issue #622 on 1/15/12
TST: Made changes as suggested by Josef in issue 622
Merge pull request #623 from j-grana6/slowtests

Slowtests in emplike, closes #622
Merge branch 'master' into Rrlm