Never use eval() to parse data from the network, closes #30

Using eval() is a huge security risk. The 'anyjson' module is able to
pick the best json implementation available (such as simplejson) which
is even faster than eval().
Use POST instead of GET for search queries

While Solr itself has no limitation on GET query length, the underlying
servlet container might. For instance, the default Jetty setting is a
little under 4kB. This limit is really easy to reach with multi-field
queries.

POST queries on the other hand have a much higher limit by default on
all servlet containers (4MB on Jetty).
Merge pull request #32 from RemiCardona/dev

Use POST instead of GET for search queries
Adapts tests to anyjson
Updates docs about dependencies
Docs about passing the version as parameter in the init. Closes #28
Updates styles
Adds Rémi Cardona to authors
Merge branch 'dev' of github.com:RedTuna/mysolr into dev
Fixes tests for Solr 4 and use python 3.3
Bumped version 0.8.1
Fixes travis script
Fixes python3 tests
Updates readme
Merge branch 'dev'