initial import Extension astro for SITools2 version 2
add .gitignore + ROOT_DIRECTORY to build.properties
Merge branch 'master' of https://github.com/SITools2/Astronomy-Extension-v2 into dev-mathieu
Bug fixes and refactoring
Adding a test
Bug fixed for Name Resolver.
Set Time out of 10 seconds when calling a name resolver.
Refactoring
Javadoc
Adding unit tests
Adding type of celestial body from the IMCCE response
Adding a test for OpenSearch service calling Cone Search Protocol
Adding a test for OpenSearch service calling a Simple Image Access Protocol server.
Refactoring javadoc
Adding cache capabilities based on the cache directive in the HTTP response
Most of services use the cache capabilities
Updating Javadoc
Equinox in WCSTransformer is required. However, equinox is not required when reference system is ICRS. Then, when equinox is not found then equinox = 2000 by default.

Fix problem in OpenSearchVOSiaSearch in getDouble* getInt* and getFloat* methods : add a test when the value is empty
Bug fixed when the response is filtered
Adding cache mechanism for VO services (CSP, SIAP)
Add a cache in the proxy plugin
Decode parameter that is send by the client
Modify Java Heap space for cache in config file
- Fix a bug when parsing SIAP
- implementation of PGSHERE in progress