2.0.0 beta2

[natebird]

Most of changes below are to make things consistent with the Vapor MySQL counterpart and to help support features in the PostgreSQL Driver.

Changes:

• Rename connection parameter from host to hostname. This allows for supporting master and read replica in PostgreSQL Driver.
• Rename connected boolean to isConnected.
• Rename connection pointer to cConnection.
• Rename error var to lastError.
• Move all connection tests into the ConnectionTests file.

New:

• Add Error class for better error messaging.
• Add Context class with isPostgreSQL var.

[codecov-io]

Codecov Report

Merging #36 into master will decrease coverage by 2.77%. The diff coverage is 71.65%.

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   92.65%   89.87%   -2.78%     
==========================================
  Files          14       17       +3     
  Lines        1879     1966      +87     
==========================================
+ Hits         1741     1767      +26     
- Misses        138      199      +61

Impacted Files	Coverage Δ
Tests/PostgreSQLTests/MiscTests.swift	100% <100%> (ø)
Tests/PostgreSQLTests/PostgreSQLTests.swift	96.44% <100%> (+0.21%)	:arrow_up:
Sources/PostgreSQL/Notification.swift	100% <100%> (ø)	:arrow_up:
Sources/PostgreSQL/Context.swift	100% <100%> (ø)
Sources/PostgreSQL/ConnectionInfo.swift	66.66% <100%> (ø)	:arrow_up:
Sources/PostgreSQL/Error.swift	5.26% <5.26%> (ø)
Sources/PostgreSQL/Connection.swift	81.37% <64%> (-3.9%)	:arrow_down:
Tests/PostgreSQLTests/Utilities.swift	53.57% <85.71%> (ø)	:arrow_up:
Sources/PostgreSQL/Database.swift	84.61% <87.09%> (ø)	:arrow_up:
Tests/PostgreSQLTests/ConnectionTests.swift	87.5% <90.69%> (+7.5%)	:arrow_up:
... and 3 more

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