1. subscribe.service.ts:
a. Method "subscribeToCommunity()" renamed to "subscribeToCommunityByEmail()" and method "unSubscribeToCommunity()" renamed to "unSubscribeToCommunityByEmail()".
b. Add methods: "getNumberOfCommunitySubscribers()", "subscribeToCommunity()", "unSubscribeToCommunity()".
c. Method "isSubscribedToCommunity()": API changed to return true/ false without revealing users' emails (no processing needed here anymore).
d. Methods: "isSubscribedToCommunity()", "subscribeToCommunity()", "unSubscribeToCommunity()" - DO NOT SEND user email, API will do the work via token ("X-XSRF-TOKEN" header).
2. connectSubscriber.guard.ts: Use new method "isSubscribedToCommunity()" without email parameter (subscribe.service).
git-svn-id: https://svn.driver.research-infrastructures.eu/driver/dnet40/modules/uoa-services-library/trunk/ng-openaire-library/src/app@58459 d315682c-612b-4755-9ff5-7f18f6832af3