Replaced IReadOnlyList<T> by ReadOnlyCollection<T>
Cleanup indexing api, Where/Select with indices, minor tweaks
Added zipInto and zipAlignInto for Series and Frame with tests, plus one bug fix same as issue #30 but for series

Conflicts:
	src/SeriesModule.fs
	tests/FSharp.DataFrame.Tests/Series.fs
Test 'Can join series with lookup and skip over missing values' currently fails

Conflicts:
	tests/FSharp.DataFrame.Tests/Series.fs
Better handling of incomparable index keys, add zip
Merge changes, reimplement zipping
Fix #41 and minor edits
Merge pull request #32 from buybackoff/upstream

Replaced IReadOnlyList<T> by ReadOnlyCollection<T>
Merge changes, fix #37, add fill missing to vectors, update NUnit
Fix #29
Remove duplication, fill missing correctly
Renames and fix documentation
Renames and fix documentation (forgotten file)
Support dynamic for setting/reading series (#42)
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/Common/Common.fs
	src/FrameExtensions.fs
	src/FrameModule.fs
	src/Series.fs
	src/SeriesModule.fs
	tests/FSharp.DataFrame.Tests/Frame.fs
	tests/FSharp.DataFrame.Tests/Series.fs
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/Common/Common.fs
	src/FrameExtensions.fs
	src/FrameModule.fs
	src/Series.fs
	src/SeriesModule.fs
	tests/FSharp.DataFrame.Tests/Frame.fs
	tests/FSharp.DataFrame.Tests/Series.fs