Default post_type to 'Post' for non-registered post types

Resolves #214
Merge branch 'develop' into issue-214
Do not try to get edit links for terms that do not exist

Resovles #217
Disable tracking of transients #217
Filter out keys with empty values
Revert "Filter out keys with empty values"

This reverts commit dcef0ba59254e32bc6a9853bacb2eae9c3fdc74b.
Merge pull request #227 from x-team/issue-214

Default post_type to 'Post' for non-registered post types
Merge pull request #228 from x-team/issue-217

Do not try to get edit links for terms that do not exist
Merge pull request #229 from x-team/issue-224

Disable tracking of transients #224
Merge branch 'develop'