Added POST support

I added POST endpoints to ensemblrest library
Added Python.gitignore
Added docstring to lambda function

Now EnsemblRest methods have documentation
Rate limiting EnsEMBL requests

Now the system does 15 requests/second, like the example in
https://github.com/Ensembl/ensembl-rest/wiki/Example-Python-Client
GET request handle Optional parameters - checking mandatory params in URL

mandatory params are checked according REST endpoints. All additional
params submitted in a GET method now work properly
Config file tested - examples.py rewrote

example.py test each endpoints of ensembl and ensemblgenomes. Config
file was fixed when parameter are missing, and names were corrected to
be easier to use
IMPORTANT: replaced '?' in '"' in LICENSE.rst. Added license reminder in sources

As reported in http://www.gnu.org/licenses/gpl-howto.html, each source
file in the whole project needs to have this text

    This file is part of Nome-Programma.

    Nome-Programma is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Nome-Programma is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Nome-Programma.  If not, see <http://www.gnu.org/licenses/>.

Where 'Nome-Programma' was set to project name. I have replaced the
? symbol with " from LICENSE.rst (maybe could be an encoding issue?)
Documentation modified - minor fix in code

Now documentation describes al the methods and how to use endpoints
Test modules updated

Now I will testfunction by doing the same query with curl and comparing
results.
Merge pull request #11 from bunop/post-support

POST support and numerous other fixes