Added client methods CreateDirectory() and RemoveDirectory()
For better standard file system interface compatibility:
- Renamed CreateDirectory() to MkDir()
- Integrated RemoveDirectory() into Remove()
Fixed an error in marshalUint64() that resulted in incorrect marshalling of values >= 2^24
Added function Chtimes() to modify access and modification time of a file
Added client methods Mkdir() extend Remove for directories

Adds the Mkdir() to create a new directory on the SFTP server and also extends
Remove() to remove directories as well.
Fixed an error in marshalUint64() that resulted in incorrect marshalling of values >= 2^24
Added function Chtimes() to modify access and modification time of a file
Change log.Fatal to log.Fatalf

The first argument is a format string, so this should likely be log.Fatalf.
Merge pull request #9 from jonathanpittman/patch-1

Change log.Fatal to log.Fatalf
Merge pull request #4 from claudiofelber/master

Added client methods CreateDirectory() and RemoveDirectory()
Fix test
Merge from nemith-master
Merge branch 'nemith-master'
Merge pull request #7 from nemith/master

Mkdir and remove directory, Chtimes, and marshal error
Implement io.Seeker for *sftp.File

Test that reads at the seeked offset of sftp.File are consistent with
the reads of offset of os.File for the same file.

Error conditions and undefined seeks are not tested.
Consistent puncutation, names and constants

  * European sentence punctuation, consistent with package docs
  * Match os.SEEK_* constants instead of numeric constants from io.Seeker
  * Consistent (shorter) receiver name for quickcheck value
Merge pull request #11 from streadway/seek

Implement io.Seeker for *sftp.File
Convert Chtimes to a setstat call for reuse with other stat setting functions.
Merge commit 'ecc928e8ba95a479858406dd87029a55cbd3262b'
Slightly refactor Chtimes and add support for other variants of setstat.