Bug fix for feilds longer than Sage Limits
Substring them to actual limit. Plausible that EM users will want them
longer for booking info, so just chop rather than validate. End client
will be able to modify once in Sage Pay anyway.
fixes #8 #9
NOOP tabs and indentation
Merge pull request #10 from andyplak/v1.5.3

V1.5.3