Add some docs for VersionManager, tries to improve error checking in PdoManager to avoid crash, a=chris

Author Chris Pollett <chris@pollett.org>
Author date 2018-04-14 15:Apr:th
Author local date 2018-04-14 08:Apr:th -0700
Committer Chris Pollett <chris@pollett.org>
Committer date 2018-04-14 15:Apr:th
Committer local date 2018-04-14 08:Apr:th -0700
Commit 1c0953e45728bf339637f4a0c6c00a1da466870d
Tree 8e7143ed9b0411719af3c156f86566ebb8dea0bb
Parent d04cd3d0ba239c59ba7473b819ad58f38e9ac426
Add some docs for VersionManager, tries to improve error checking in PdoManager to avoid crash, a=chris
Affected files:
src/library/UpgradeFunctions.php
src/library/VersionManager.php
src/models/datasources/PdoManager.php
tests/VersionManagerTest.php
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