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Special treatment for message_runtime

The catkin documentation insists on message_runtime being an
exec_depend. See ros/catkin#701 for further discussion.

Closes #18
Relax message_runtime check

As proposed by @dirk-thomas in ros/catkin#701, catkin_lint will accept
message_runtime both as build_export_depend and exec_depend. If both
are missing, however, it will complain and ask for an exec_depend as
documented in the catkin manual.
Check for sensible indentation

The indentation rules are quite simple: each if() and foreach() block
must have its commands indented further in, each command in a block
including the top level should be on its own line and with consistent
indentation.

One more item off the list in #4
1.3.10
Merge version 1.3.10
1.3.10-1