Add guc for max # db to store
Merge pull request #3 from rjuju/guc

Add guc for max # db to store
Fix formatting in README.rst
Second round of fixes in README.rst
Remove limitation about MAX_DB_ENTRIES in README.rst
Update documentation about user views and functions
Add license and authors informations.
Fix typo in README.rst
Specify that the kernel block size is 512 bytes in the Limitations section.