Merge branch 'hotfix/v0.5.1'

* hotfix/v0.5.1:
  forgot openpyxl dependency
  bump version
Merge branch 'release/v0.6.0'

* release/v0.6.0:
  bump version
  ?
  cleanup
  tests cleanup
  #7: import supports sheet references
  #9: import all worksheets
  no columns or no data? no problem
  cleanup
  fixed README.md formatting
  #6 handle unnamed files
  more better README
  little things
  don't need that
  logging that much is expensive. sort out excel floats which are just ints
  lots of things to change to handle excel
  handle file names better now that we got xlsx
  didn't have the test file? geez
  operational xlsx import. not sure about data type inference
  truncate was pretty easy
  use glob patterns for import. mostly for windows, where the command line doesn't expand things
Update README.md
Update README.md
Merge branch 'master' of https://github.com/3nth/diepy into develop

* 'master' of https://github.com/3nth/diepy:
  Update README.md
  Update README.md