fixed majority of java-related warnings

src/com/savoirfairelinux/sflphone/account/AccountDetail.java

...oirfairelinux/sflphone/account/AccountDetailAdvanced.java

...savoirfairelinux/sflphone/account/AccountDetailBasic.java

.../savoirfairelinux/sflphone/account/AccountDetailSrtp.java

...m/savoirfairelinux/sflphone/account/AccountDetailTls.java

...oirfairelinux/sflphone/account/AccountDetailsHandler.java

...savoirfairelinux/sflphone/account/CallDetailsHandler.java

...com/savoirfairelinux/sflphone/account/HistoryHandler.java

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

...avoirfairelinux/sflphone/adapters/ContactPictureTask.java

...m/savoirfairelinux/sflphone/adapters/ContactsAdapter.java

...oirfairelinux/sflphone/adapters/SectionsPagerAdapter.java

...rfairelinux/sflphone/adapters/StarredContactsAdapter.java

...fairelinux/sflphone/client/AccountPreferenceActivity.java

src/com/savoirfairelinux/sflphone/client/AccountWizard.java

src/com/savoirfairelinux/sflphone/client/CallActivity.java

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

...airelinux/sflphone/client/SFLPhonePreferenceActivity.java

...oirfairelinux/sflphone/client/ZoomOutPageTransformer.java

...airelinux/sflphone/fragments/AccountCreationFragment.java