Minimal CMake version is 2.8 not 2.6
cmake: FindSQLite3 - add handling of SQLITE_ROOT_DIR
backends/oracle: support working in multithreaded programs

OCI_THREADED ensures that shared OCI data is properly protected.

OCI_ENV_NO_MUTEX avoids using mutexes when there are no concurrent
accesses to a session, which is the multithreading model that SOCI
employs.

More details:
http://docs.oracle.com/cd/B10501_01/appdev.920/a96584/oci15re4.htm
Merge pull request #31 from avg-I/oracle/multithreading

backends/oracle: support working in multithreaded programs
updated searched names to handle sqlite from GIS/OSGeo environment
Merge pull request #29 from snikulov/find_sqlite_update

cmake: FindSQLite3 - add handling of SQLITE_ROOT_DIR
Update .travis.yml

Removed mloskot's secondary e-mail
Update README

Post-GitHub migration update, added Travis CI page.
Merge pull request #34 from mloskot/master

README update and minimal CMake version update