Twitter Timeline: fix Undefined index notice
tweet-limit was undefined in defaults

Read more about the issue here:
http://wordpress.org/support/topic/undefined-index-tweet-limit
Twitter Timeline: add a message to explain 0 tweet-limit

See #6 for more details.
i18n: update Nova CTP to use the Jetpack textdomain

More details here:
http://plugins.trac.wordpress.org/ticket/2089
Open Graph: change og:type of home and front page queries to website
Props @niallkennedy

For more details, see original trac ticket:
http://plugins.trac.wordpress.org/ticket/1946
add a composer.json for this plugin
add a git ignore and put the composer vendor folder into it
Open Graph: add `published_time`, `modified_time`, and `author`
Props @niallkennedy

For more details, see the original ticket:
http://plugins.trac.wordpress.org/ticket/1881
Sharing: display sharing buttons on CPT archive pages
when selected in Sharing settings

For more details, see original ticket:
http://plugins.trac.wordpress.org/ticket/2068
Revert "Twitter Timeline: add a message to explain 0 tweet-limit"

This reverts commit 2eedb2e8ed092f58f07f65daaaa92967a11bc776.
Twitter Timline: use null as default value for # of tweets
Null is the default value (unlimited amount of tweets)
Input now uses `number` type with `min` and `max` values as recommended in the twitter documentation:
https://dev.twitter.com/docs/embedded-timelines

See discussion in #6 for more details.
Social Links: add Google+ to the list of supported services
Merge pull request #19 from jeherve/social-links-google

Social Links: add Google+ to the list of supported services
Social Links: add missing trailing comma
Thanks @nb for the recommendation!
https://github.com/Automattic/Jetpack/commit/124b2fae09f37bd19a20af25d13ba2496823e0c4#commitcomment-4906602
Open Graph: add 2 Click Social Media Buttons to the conflicting plugins
Stats module dash styles
Updated CSS for dashboard stats widget to match styles in MP6
Stats module - with pre 3.8 fallback CSS
Merge pull request #22 from Automattic/lessbloat-akismet-dash

Stats module dashboard styles
Updates stats module CSS to match MP6 styles, uses .pre-mp6 prefix for backwards compat.
Contact Form: fix Uninitialized string notice
Props @iandunn

Notice happens on a local environment, with WP_DEBUG set to true and Akismet activated.
Merge pull request #13 from Tarendai/master

Add Composer support to Jetpack!
Add a composer.json file and add /vendor/ to the .gitignore file.
Merge pull request #6 from jeherve/tweet-limit-notice

Twitter Timeline `undefined index` & html5 input.
Migrate the tweet-limit to use input type="number" and set a min and max of 1 and 20, respectively.
Fix the undefined index by setting a default.