Add scrapers for Merit Systems Protection Board

Adding both Precedential and Nonpredecential scrapers.  Slight differences in the report parsing for each.
Add scraper for the Bankruptcy Appellate Panel of the Tenth Circuit

The meta-data available is poor.  Using the opinions.txt pipe-delimited text file for meta-data.
Indiana Supreme Court: Bug fix: Recognize "(NFP)"

Recognize "(NFP)" in case names as indicating a Nonprecedential opinion.
Changes the logic of the bap10 scraper so it's in the _clean_text function instead of the _get_case_dates function.
Cleans up mspb:
 - removed extra imports
 - makes mspb_u inherit from mspb_p by adding a column_diff attribute.
Minor tweaks.