Functions Framework 1.0.0-beta2

• Removed code for old-style function signatures.

The old style was package.name.ClassName.methodName, which was the only form
recognized by the obsolete GCF java8 runtime. The new style is just
package.name.ClassName, which we retain. This change makes for a less confusing
error message when you try to deploy or invoke a function using a class name
that doesn't exist.

• Fixed a bug in the plugin concerning dependencies.

We were using compile dependencies only when doing mvn function:run,
where we should have been using runtime dependencies. Thanks to
@graemerocher for the fix.