Added custom adapter for AccountSelectionSpinner and async details loading

res/layout/item_account.xml

...rfairelinux/sflphone/account/AccountSelectionSpinner.java

...fairelinux/sflphone/adapters/AccountSelectionAdapter.java

...avoirfairelinux/sflphone/adapters/CallElementAdapter.java

...avoirfairelinux/sflphone/client/SFLPhoneHomeActivity.java

...relinux/sflphone/fragments/AccountManagementFragment.java

...airelinux/sflphone/fragments/CallElementListFragment.java

src/com/savoirfairelinux/sflphone/model/SipCall.java

...elinux/sflphone/service/ConfigurationManagerCallback.java