Release Notes - Apache Twill - 0.7.0-incubating

New features:
[TWILL-148] Allow setting of environment variable on Twill containers
[TWILL-158] Provides an implementation of Location and LocationFactory using FileContext instead of FileSystem

Improvements:
[TWILL-142] Add longer time for timeout in EchoServerTestRun to check whether the restart successful
[TWILL-153] Twill containers should use the container size allocated by YARN
[TWILL-154] Support for Azure Blob Storage
[TWILL-155] TwillLaunch should sort the jars paths when creating the classloader

Bug fixes:
[TWILL-77]  Fix BundleJarExample NPE and BundleJarRunner
[TWILL-131] Zookeepers nodes are not removed
[TWILL-141] ZKClient created through ZKClients.namespace fails in create call
[TWILL-144] When localizing URI with "#name" fragment, the #name part is not preserved when asking YARN to localize the file.
[TWILL-145] Potential race condition when restart all is called for a Twill runnable
[TWILL-151] Improve Logging error when fetching message after Kafka server is stopped
[TWILL-156] LocalLocation using File.renameTo fails for Windows when the destination file exists
[TWILL-160] LocalLocation shouldn't create parent directory on getInputStream
[TWILL-161] SimpleKafkaConsumer should backoff on failure when fetching messages