Wp Favs integration

[timersys]

Hi Guys as commented on #687 here is the pull request with a simple integration of Wp Favs.
I just added one new function to grab the plugins from the API and updated the example.php with a working token example.

Thanks!

ps: Why you use themes as default screen for installing plugins? Just curious

[jrfnl]

Hi @timersys, I haven't looked at the code yet, but I like the idea of this.
However, users can also have a favorites list on wordpress.org. So I'm wondering if this PR would be accepted, if the favorites list on WP.org shouldn't also be supported.
Supporting an external service, but not a WP native implementation feels arbitrary.

Also, as this is a new feature, I think it should go into a minor release - in contrast to a patch release, like the 2.6.2 version we're currently preparing for -, so I'm tagging this with 2.7.0. /cc @GaryJones

As a side-note: you may want to have a look at the Travis output. The codestyle errors will need to be fixed before this PR can be considered: https://travis-ci.org/TGMPA/TGM-Plugin-Activation/jobs/268774079#L685-L760

[timersys]

Hey @jrfnl , I could add the native wp.org favorites support. I already got that bit of code so no problem with that.
I will review everything and update accordingly.

[timersys]

So I added the wp favorites feature. Take in consideration that I added these 2 features as separate functions and didn't integrate them in the main class as I wasn't sure you wanted to go that route.