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.
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.
Merge pull request #10 from jeherve/2089-trac

Nova/Restaurant CPT: Textdomain Fix.
Merge pull request #16 from jeherve/1881-trac

Open Graph: add `published_time`, `modified_time`, and `author`
Merge pull request #17 from jeherve/2068-trac

Allow sharing buttons on CPT archives
But only if they've enabled it for the CPT in general.  Otherwise don't show it.
Merge pull request #25 from jeherve/2010-trac

Contact Form: Fix Uninitialized string notice
Merge pull request #11 from jeherve/1946-trac

correct the homepage OG tag to `website` instead of `blog`
props @niallkennedy
Sharing: Strip tags from title before sharing.

Ideally, we should be calling this on the `$post->post_title` for all
sharing modules that don’t support html.  This is a temporary fix, and
should be expanded to the other sharing services.
Fixes #31