Fix Series class "previous" property name typo
Merge pull request #4 from ddx/develop

Fix Series class "previous" property name typo
Fix result/results typo
Fix str_to_datetime call
Clean up import statements
Fix how params and json are passed

json module unnec, let requests do the work for json and url encoding
Clean up: spelling, naming style

Remove duplicate property
implement next, previous with helper methods
Generalize related_resource

Fix bug with foo/{id}/bar not remembering attributes on .next()
PEP8 formatting
Simplify structures

Summaries to own file for simpler class inheritance
Add kwargs to next & previous
Complete some testing todos

Add to tests for chaining
Fixup chaining test
abstract away most of specific DataWrapper classes
All summaries to chain for API access
PEP 8 Formatting