Removes root imports

[Koed00]

• removes imports like async from the package root when using Django 1.9.
  1.9 does not like this and it's probably a better not to anyway.
• updated boto3
• updated docs to reflect the new import paths.

[codecov-io]

Current coverage is 95.60%

Merging #74 into master will increase coverage by +0.01% as of bbf2c20

@@            master    #74   diff @@
=====================================
  Files           36     36       
  Stmts         2043   2048     +5
  Branches         0      0       
  Methods          0      0       
=====================================
+ Hit           1953   1958     +5
  Partial          0      0       
  Missed          90     90       

Review entire Coverage Diff as of bbf2c20

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