Merge pull request #76 from akkie/master

Set access modifiers for providers
Fix typo
Merge pull request #77 from fernandoacorreia/fix-typo-1902

Fix typo
Allow dead code in coverage testing

Resolve #71 and #75
Merge pull request #78 from fernandoacorreia/fix-scoverage-test-compile

Allow dead code in coverage testing
Tests for Twitter and LinkedIn OAuth1 providers