DOC: Add example for get_value_by_ids

This method was missing the Examples section in the docstring and is now
referenced from Table.data and vice versa.
Merge pull request #534 from ElDeveloper/doc-addition

DOC: Add example for get_value_by_ids
ENH, DOC: added and documented new update_ids method
added unit tests
REL: added note to changelog, fixes #533
REV: removed accidentally added files
MAINT: typo fix
ENH: updated based on comments from @wasade
ENH: updated based on comments from @wasade
ENH: added inplace option, True by defualt to match related functionality, such as filter
TST: tests of inplace option
MAINT: some minor clean-ups
DOC: updated based on comments from @ElDeveloper
MAINT: pep8 fix
Merge pull request #536 from gregcaporaso/issue-533

added Table.update_ids method
ENH: collapse now operates over the table instead of reduce
MAINT/STY: removed print statement
TST: added median test for collapse
DOC: changelog mention
Merge pull request #547 from wasade/collapse_update

Collapse update