first draft
migrations supported, log lines, metrics, sqlite in tests.

Perhaps @mausch could lend a hand in getting the execNonQueryAsync to work
without throwing ObjectDisposedException? :)
works with non-async method
more aptly named index
passing tests, some TODO tests added

What's left is verifying good data is saved in the fields
by completing the skipped tests.
minor formatting
try opening the connection in init step depending on its state
formatting
passing tests with SQLite
formatting code comments nicely
testing existence in table
passing reading tests
passing tests for LogLines
Merge branch 'feature/target-db'

Closes #2 https://github.com/logary/logary/pull/2