CLOUDIFY-2378 use jclouds 1.6.4-SNAPSHOT and guava 14.0.1

I must use JRE 1.7.0_55+ to run my apps.  The guice/guava/jclouds reflection issue with JRE 1.7.0_51+ is impacting me.

A set of changes to reflection usage was made in https://issues.apache.org/jira/browse/JCLOUDS-427 and merged into the 1.6.x branch.  1.6.4 has not been released yet, but the SNAPSHOT version is fairly stable and contains the workarounds for the bug impacting Cloudify 2.7.x.  Also, jclouds 1.6.2-incubator is supposed to be deprecated by 1.6.3.

Also, guava 14.0 was an accidental clone of rc2 so 14.0.1 was made from rc3 as per the release notes and is the correct version to use.