Updated TableCreationScript for SQL Azure

The TableCreationScript didn't have a clustered primary key on the
MiniProfilers table, and would fail when used in SQL Azure. By adding
the unused RowId column profiling can now be saved to SQL Azure. An
additional unique index IX_MiniProfilers_Id has been added to replace
the loss of the PK constraint on the Id column.
See http://stackoverflow.com/a/14775721/495964
Merge pull request #114 from JSkimming/SQLAzure_TableCreationScript

Updated TableCreationScript for SQL Azure