[EmployeeDirectory] Target API_14 which we install be default (rather than API_15, which we don't)
[EmployeeDirectory] fix WP7 Toolkit reference (hint to file reference, rather than excpect it to already be around)
[EmployeeDirectory] add readme note about the different solutions
[FieldService] Target API_14 which we install by default (rather than API_15 which we don't)