Friendly Role Names and roles from URLs

* Roles can now be given a friendly name as third field in role spec csv
* Roles can be installed from URL (not just from archived SCMs)
* Integration tests to demonstrate this
* Unit tests to ensure that role spec parsing works as expected

test/integration/galaxy_playbook.yml

@@ -3,3 +3,4 @@
 
   roles:
   - "git-ansible-galaxy"
+  - "http-role"

test/integration/galaxy_rolesfile

@@ -1,2 +1,3 @@
-git+http://bitbucket.org/willthames/git-ansible-galaxy,v1.3
+git+http://bitbucket.org/willthames/git-ansible-galaxy,v1.4
 hg+ssh://hg@bitbucket.org/willthames/hg-ansible-galaxy
+https://bitbucket.org/willthames/http-ansible-galaxy/get/master.tar.gz,,http-role