Added new methods to the interface

added ReleaseFiles methods
added another PtG method with the transfer protocol list as further
parameter
changed the returned type of the PtG methods to include the
request-token information
cleared typos
Added srmRm and srmRmdir methods
Addedd support for PtP and Pd
Added new interface methods

srmPtP
srmPd
srmReleaseFiles
srmPTG (updated)
srmRm
srmRmdir
Merge pull request #5 from italiangrid/feature/multiple-updates

Feature/multiple updates