sourceipk: copy over hidden files and dirs

sourceipk: copy over hidden files and dirs

* Copy hidden files and directories such as eclipse
  project files.  Currently these files are not copied
  for the top-level directory which makes applications with
  eclipse project files not usable with eclipse.
* Only need to copy hidden files for the top-level directory
  since subdirectories do not experience this problem

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>
Acked-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>