Log rollup exception stacktraces

Rollups are failing in prod, and we need to find out exactly where they are failing. This isn't helpful:

    2014-07-18 00:00:21,074 87975613 [pool-8-thread-66] ERROR com.rackspacecloud.blueflood.service.RollupRunnable  - Rollup failed; Locator: XXX, Source Granularity: metrics_full, Exception: java.lang.ClassCastExceptio

We need to do an audit of all our try{}catch{} and error logging statements to make sure we log the full stack trace when an exception occurs.

Changes:

Do not include exception in log template

    Do not include exception in log string template or the stacktrace will
    be lost.


Include the range that rollup failed on

    Include the range that rollup failed on so one can find the data in the
    db for debugging purposes.


Catch on Exception instead of Throwable

    `Throwable` has 2 subclasses: `Exception` and `Error`. According to the
    java docs, quote:

        An Error is a subclass of Throwable that indicates serious problems
        that a reasonable application should not try to catch.

    http://docs.oracle.com/javase/7/docs/api/java/lang/Error.html