Added HKDFExpandOnly
Added tests for HKDFExpandOnly
Fixed test failures
Added documentation
Renamed HKDFExpandOnly to HKDFExpand
Modified HKDF to use HKDFExpand
Minor fixes
Multibackend now supports all of RSABackend

Also convert some examples to doctest
Merge pull request #1028 from reaperhulk/multibackend-rsabackend

Multibackend now supports all of RSABackend
Improve RSABackend interface docs (fixes #1022)
Use bold instead of italics
Merge pull request #1031 from reaperhulk/rsa-docs-fix

Improve RSABackend interface docs (fixes #1022)
Merge pull request #1032 from reaperhulk/bold-docs

Use bold instead of italics
Added missing exception to documentation
Merge pull request #1016 from Ayrx/hkdf-expand-only

HKDF Expand Only implementation
Function to get current compression and expansion
Merge pull request #1035 from phibos/get_comp_name

Function to get current compression and expansion
add HKDFExpand to changelog
Merge pull request #1037 from reaperhulk/update-changelog

add HKDFExpand to changelog
Simplify some code that was needlessly complex