Update README.md

Expand on Notes section.
Create class-gamajo-dashboard-rightnow.php

Add BC support for Right Now widget in WP 3.7 and earlier.
Add notes for WP 3.7 compatibility

Add a section explaining how the Gamajo_Dashboard_RightNow extension class can provide similar counts output for WP 3.7.
Fix Strict Standards error
Fix undefined variable
Fix undefined variables in get_markup

Looks like a minor typo in the variable name $text_parts.
Ternary Not Working

I couldn't get this ternary operator to work for me.  It always returned the single label regardless.  Running PHP 5.4.  Perhaps there's something I'm missing, but switching it to an if/else statement seemed to get it working.
Merge pull request #2 from devinsays/patch-1

Fix undefined variables in get_markup
Merge pull request #3 from devinsays/patch-2

Fix label ternary
Merge pull request #1 from grappler/patch-1

Fix undefined variable
Add Scrutinizer badge
Use succinct code

Tidy up b77def64925b02f1192ed85df482abbd3f13b171

See #3
Force $count to be integer

See #4, hattip grappler
Remove i18n from developer error message

Fixes #6, props @grappler