Merge pull request #152 from caseybryant/HDFtoDB

M114 Coverage Model Integration
Merge pull request #153 from caseybryant/HDFtoDB

Changes to eliminate inconsistent PostgresDataStore construction.
Merge pull request #154 from caseybryant/HDFtoDB

M114 - Coverage Model Integration
Adds test to confirm simple search
Merge pull request #156 from ooici/simplesearch

CIDEVSTC-288 - Adds test to confirm simple search
Updates async dispatcher tests
Merge pull request #157 from ooici/threads

Updates async dispatcher tests
Fixed libc load error.
Fixed an error in the SearchCoverage.find method.
Added a check to ensure that different master manager objects were being compared for equality.
Added statistics calculations for a coverage.
Added ability to search by ISO time string as well as 64-bit float.
Added ability to auto-convert from older version to new version.
Removed HDF remnants from tests.
Cleaned up extraneous logging.
Merge branch 'master' of https://github.com/ooici/coverage-model into HDFtoDB

Conflicts:
	coverage_model/test/test_complex_coverage.py
Initial implementation of interface changes for M117.