Bumping podspec to v2.7.3
Bumping podspec to v2.7.3

dezinezync/YapDatabase,nivanchikov/YapDatabase,danthorpe/YapDatabase,dezinezync/YapDatabase,yakatak/YapDatabase,dezinezync/YapDatabase,danthorpe/YapDatabase,nivanchikov/YapDatabase,yakatak/YapDatabase,skeeet/YapDatabase,yakatak/YapDatabase,nivanchikov/YapDatabase,dezinezync/YapDatabase,skeeet/YapDatabase,danthorpe/YapDatabase,danthorpe/YapDatabase,danthorpe/YapDatabase,skeeet/YapDatabase,nivanchikov/YapDatabase,dezinezync/YapDatabase,yakatak/YapDatabase,skeeet/YapDatabase,yakatak/YapDatabase,nivanchikov/YapDatabase