Merge pull request #197 from seesmith/master

IOG, Exhibitions and Calendars updates
LIB001-882: Updated config files for oaipmh and ga codes
Merge pull request #198 from ianthe/LIB001-882

LIB001-882: Updated config files for oaipmh and ga codes
LIB001-837 Links on homepage
Merge pull request #199 from rentonsa/LIB001-837

LIB001-837 Links on homepage
LIB001-875: New exhibitions slide and corrections of past exhibitions link
Merge pull request #200 from ianthe/LIB001-875

LIB001-875: New exhibitions slide and corrections of past exhibitions li.... nk 
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LIB001-869: Adding Accession Number to the mimed advanced search
Merge pull request #201 from ianthe/LIB001-869

LIB001-869: Adding Accession Number to the mimed advanced search
LIB001-886: Dropping www from exhibitions on collections homepage
Merge pull request #202 from ianthe/LIB001-886

LIB001-886: Dropping www from exhibitions on collections homepage
LIB001-888 - IOG config
Merge remote-tracking branch 'upstream/master'