Bumped version number.
Added helper function to InstrumentBase, to ease writing in functions.
Fixed several bugs in cryomagnetics module.

Several bug fixes wered done:
 * Added limits to `Range.rate` Command, fixes #132.
 * The MPS4G class now forwards its config to the Shim and Range classes, fixes #133, fixes #134.
 * Correct format strings are now used for the MPS4G.lower_limit, MPS4G.upper_limit as well as Range.rate and Range.limit, fixes #135, fixes #136.
Merge branch 'hotfix-mps4g'