bcolz is willing to load into memory
Merge branch 'master' of github.com:ContinuumIO/blaze into bcolz-loads-into-memory
Merge pull request #722 from mrocklin/bcolz-loads-into-memory

Bcolz loads into memory
Return len on encountering a struct/record array in count
Do not handle struct arrays
Clean up tests
Merge pull request #734 from cpcloud/hotfix

Explicitly fail on encountering a struct/record array in count
isnull and dropna exprs
isnull/dropna for pandas
isnull/dropna for bcolz
clean upgs
Change to dropna
remove from expressions.py
broadcast cleanup
collections cleanup
Add null for DropNA and IsNull
isnull and dropna for bcolz
isnull and dropna for pandas
Imports for doctest