Client dialog for untrusted server certs

Added client dialog to prompt user to accept an untrusted server
cert for a connection with SSL/TLS (untrusted) encryption; also
includes an option to remember the cert.
Added ge0rg/MemorizingTrustManager code snapshot 49452f67a7 as an
Android library to facilitate client dialog.
Updated ant and Gradle build scripts to support the
MemorizingTrustManager Android library.
Updated ant build script to use the svmp-protocol-def symlink
instead of a hard-coded relative path.
Updated README.md to include updated Eclipse instructions and add
IntelliJ IDEA instructions.
Updated AppRTCDemoActivity and SVMPAppRTCClient to localize all
Toast messages into String resources. Also added more specific
SSL failure detection with appropriate descriptive Toast messages.

Change-Id: Ic8c38698528009de9379ba74cfa323452b29e33c