Add an init method on Proxy

To avoid bad behavior on consecutive calls
Merge pull request #18 from j0k3r/proxy-init

Add an init method on Proxy
Fix wrong place to reset content & url
Fix some alerts from Insight

https://insight.sensiolabs.com/projects/b3688b01-a0db-4325-a8ba-dcc59ab00fe4/analyses/36
Fix annotation
Fix test on wrong http method
Merge pull request #19 from j0k3r/insight

Cleanup from Insight
Cleanup
Fix typo
Rename Parser to Improver

And use the Symfony2 chain logic instead of custom (ugly) one
Cleanup
Merge pull request #17 from j0k3r/extractor-parser

Rename Parser to Improver
Test if host & path are defined

before even working with them
Stick to one type of variable for `content`

Avoid `false` when something goes wrong and define it as empty instead.

+ update deps
Remove unecessary test
Use album endpoint instead of gallery
Convert parser as a chain

Like I did for Extractor & Improver.

+ remove buzz
Add Parser tests
Add Improver tests

And use default improver (Nothing) to get the full url (called effective)
Add more tests on Extractor