Merge branch 'release-1.5.0' into develop
Merge branch 'hotfix-1.5.1' into develop
Correct README information on use of cwd.

This provides better information on the use of the `cwd` property in
file sets and resolves #49.
Merge branch 'fix/readme-cwd' into develop
Fix formatting of README in cwd section.
Add access to specifying %define SPEC properties.

This allows for the specification of %define properties in both the
options and task-specific configurations under the property name of
`defines`.
Merge branch 'feature/defines' into develop
Bumping version to 1.5.2
Merge branch 'release-1.5.2'