Added pages for upcoming UK boot camps

EGI Forum, Manchester 11 April (boot camp "highlights" day)
Oxford DTCs, Oxford, 19-20 May
ICSS, Southampton, June (dates to be decided)
Wellcome Trust, University of Exeter, November (dates to be decided depending on interest)
Wellcome Trust, University of Exeter (Tremough Campus), November (dates to be decided depending on interest)