do not create an index on a blob column
disable schema validation for H2 file database
delete content cache file when resetting the SOS

[fixes #80]
fixed race condition in time period test
show a warning if JavaScript is disabled

[fixes #87]
Merge pull request #89 from autermann/fix/h2-file-datasource

Working file-based H2/GeoDB (fixes #79)
Merge pull request #90 from autermann/fix/delete-cache-file-on-reset

Delete content cache file when resetting the SOS
Merge pull request #91 from autermann/fix/race-condition-in-time-test

Fixed race condition in time period test
Merge pull request #92 from autermann/fix/warning-for-disabled-javascript

Show a warning if JavaScript is disabled
Output exception causes (recursive) in ows:ExceptionReport
Throw proper exception (InvalidParameterException) when srs prefix is invalid
Fix error message grammar
Merge pull request #94 from shane-axiom/fix-getobs-invalid-srs-excode

Fix GetObservation invalid SRS exception code