Adding the possibility to set the working C locale for test

- using the command line argument -l.
Using locale independent double encoding/decoding

- At the moment relying on switching the locale to have a quick fix.
- It seems the performances are not that impacted but maybe a rewriting of the two functions would be good.
- CTest launched locale tests are commented out because the Travis machine doesn't seem to support these locals at least.
Add doubles to the performance tests

- No noticeable slowdown due to the locale switching (yes it's weird).
Updating the version number using a new 'MASA_PATCH' level
Merge pull request #2 from masagroup/fix/gen_real_locale

Fixing the locale handling for doubles encoding/decoding