Fixed #408 -- cleanup how is_available works
Explanatory comment
remove CAST5 for first release
also remove CAST5 docs
Try making the AEAD examples less dense.
Make the example more complete and add some comments walking the user through some stuff.
Merge pull request #414 from alex/avail-cleanup

Fixed #408 -- cleanup how is_available works
Merge pull request #415 from reaperhulk/remove-cast5-ecb-for-now

remove CAST5 for first release
Merge pull request #416 from dreid/improved-aead-examples

Try making the AEAD examples less dense.
move ciphercontext/aeadciphercontext to bottom of symmetric encryption

Add a bit of additional text to try to make the convoluted AEAD
explanation better.
GCM does not require padding (removing from docs example)
Merge pull request #419 from reaperhulk/gcm-no-pad-required

GCM does not require padding
Merge pull request #418 from reaperhulk/move-contexts

Move ciphercontext/aeadciphercontext to bottom of symmetric encryption
These eggs are sometimes files. We still don't care.
add padding info to docs
Merge pull request #423 from alex/ignore

These eggs are sometimes files. We still don't care.
Merge pull request #424 from reaperhulk/padding-info-for-all

Add padding info to docs
Fixed #428 -- added a changelog
Typo fix
Reformat