Create an example program demonstrating AES-256/CBC/PkcsPadding encryption and decryption
More rust-like corrections (mostly useless returns)
Fix mutable slice syntax ...

See rust-lang/rust commits:
  * 3bf405682df4dfb55b969640b811b317fa55447d
  * 4e2afb0052618ca3d758fffd0cf50559be774391

Which requires using the slicing methods in certain instances where
mutability of a slice cannot be "inferred."

This is a mostly mechanical transform; and it may have affected code
that did not _need_ to use the explicit slicing methods.
Merge pull request #193 from drbawb/feature/fix-mut-slices

Fix mutable slice syntax ...
Bump version number to 0.2.6
Merge pull request #194 from DaGenix/bump-version

Bump version number to 0.2.6
Merge remote-tracking branch 'GuillaumeGomez/master' into master

Conflicts:
	src/rust-crypto/cryptoutil.rs
	src/rust-crypto/digest.rs
	src/rust-crypto/ghash.rs
	src/rust-crypto/hmac.rs
	src/rust-crypto/poly1305.rs
Address comments from PR
Merge pull request #177 from DaGenix/first-example

Create an example program demonstrating AES-256/CBC/PkcsPadding encryption and decryption