Update CHANGELOG.md
Refactor ask() to use Highline; support echo:false.

Note: a gem dependency for highline has been added by this commit.
:panda_face: Added tests for after/before hooks

https://github.com/capistrano/capistrano/issues/1004

The changes of #938 affect the order the task executes. The "prerequisite" task seems to be running as
if it was defined in a after block, which makes sense, since it is now invoked by the task instead of being a prerequisite.

Since there were missed tests and @juanibiapina added simple tests in #1005, and were modified in this commit to cover
current business logic of the master.
Merge pull request #1024 from miry/before

Added tests for before/after hooks
Merge pull request #1028 from mbrictson/highline-ask

Refactor ask() to use HighLine; support echo:false
Fix compatibility with FreeBSD tar
Improve the output of cap --help.

Remove options documentation for rake options that aren't applicable
to capistrano, briefly explain correct cap usage, and point users to
http://capistranorb.com.
Merge pull request #1020 from robbertkl/freebsd-tar-fix

Fix compatibility with FreeBSD tar
Improve compatibility by making options optional for the question initializer
Merge pull request #1023 from mbrictson/improve-help

Improve the output of cap --help.