Remove new Layout and Typography selector added by last commit; must keep it simple
Remove options to simplify Customizer and cleanup code

* Removed Excerpt options (these can be set using a Child Theme)
* Removed Show Full Content First Post option (only applicable with excerpts)
* Cleaned up content.php code and style.css styles
Rename Hide Widgets on Single Pages option for better UX
Reintroduce Excerpt options to Customizer. Fixes #40.

* New Excerpts section in Customizer
* Excerpts options available again after user demand :)
* Excerpt options now use radio buttons to improve usability
* Rewrote Customizer to use new IndependentPublisher_Customize class
New Customizer Color options

The following colors can now be customized via the Customizer:
* Text Color
* Background Color
* Link Color
* Title and Header Text Color
* Primary Meta Text Color
* Secondary Meta Text Color
Fix Customizer bug that cuased excerpt text color to change with Link Color
Improve coverage for Customizer Meta Text Color
Fix Customizer bug that caused incorrect text color to change with Title and Header Text Color
Improve support for JetPack Infinite Scroll. See #42.
Add Known Issues section and update Theme Options documentation.
Add Colors section to documentation
When generating post excerpt remove Image Caption if it exists. Fixes #43.
Improve JetPack Infinite Scroll support. Fixes #42.
Add before and after action to independent_publisher_posted_author_bottom_card()
Remove entry content bottom margin from Aside single pages
Make 'read more' and 'continue reading' link colors obey Link Color setting.
* Right-align Post Entry Meta to improve visual flow
* Move One-Sentence Excerpt "Continue Reading" link above Entry Meta
Allow Continue Reading text to be changed via filter
Code reformatting to comply with WordPress coding standards
Replace plugin-specific code with action hook