Merge pull request #2925 from jreback/compare

ENH: numexpr on boolean frames
ENH/CLN: refactor of common code from frame/panel to generic.py
         axis creation routines now commonized under _setup_axes
ENH: more methods added

PERF: was missing multi-take opportunity in reindex
      was incorrectly passing to com._count_not_none
      doing an extra copy in certain cases
BUG: reindex with called with no args will by default return a copy (fixed bug)
ENH: moved filter and added axis arg
     moved where,mask,align

TST: make reindex benchmarks longer

CLN: fixed up names for creation in panelnd.py

DOC: minor release notes changes