Simplyfing config in TimberHelper::transient
Merge pull request #360 from alexsomeoddpilot/feature/improving-transients

Simplyfing config in TimberHelper::transient
added private var for $_next to match initialization of $_prev
Merge branch 'alexsomeoddpilot-feature/improving-timberpost'

* alexsomeoddpilot-feature/improving-timberpost:
  added private var for $_next to match initialization of $_prev
  Removing reinitialization of _prev
  Declaring _prev property
  Returning early if cached
  Removing dead assignment of in_same_cat
  Fixing case without taxonomy
  Improving TimberPost::get_prev to reduce complexity
Merge branch 'master' of github.com:jarednova/timber

* 'master' of github.com:jarednova/timber:
  Simplyfing config in TimberHelper::transient
 match initialization of $_prev
  Removing reinitialization of _prev
  Declaring _prev property
  Returning early if cached
  Removing dead assignment of in_same_cat
  Fixing case without taxonomy
  Improving TimberPost::get_prev to reduce complexity

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Update to 0.20.7!
ref #361 -- update Twig_Filter_Function to Twig_SimpleFilter to comply with twig 2.0
ref #361 -- fitlers
ref #361 -- fixed error ID'd by Travis