Override all create and open methods in EncryptedFileSystem

[ellisjoe]

Now that EncryptedFileSystem extends FilterFileSystem, many of the create and open methods will not get forwarded to the create and open methods currently implemented by FilterFileSystem (see: https://github.com/palantir/hadoop-crypto/pull/104). To fix this we either need to go back to implementing FileSystem and overriding all of the methods that are known to be broken (eg: copyFromLocal), or continue to extend FilterFilesystem and override all of the create and open methods.