Merge branch 'layout-manager'

* layout-manager: (50 commits)
  docs: Reword a link
  layout, docs: Add more documentation to LayoutManager
  layout, docs: Fix description of Bin properties
  layout, bin: Use ceilf() instead of casting to int
  layout, docs: Add long description for FlowLayout
  layout, box: Clean up
  layout, box: Write long description for Box
  layout, docs: Remove unused functions
  layout: Document BoxLayout
  layout: Add BoxLayout, a single line layout manager
  layout: Report the correct size of FlowLayout
  layout: Resizing the stage resizes the FlowLayout box
  layout: Use the get_request_mode() getter in BinLayout
  layout: Change the request-mode along with the orientation
  actor: Add set_request_mode() method
  [layout] Remove FlowLayout:wrap
  [layout] Rename BinLayout and FlowLayout interactive tests
  [layout] Skip invisible children in FlowLayout
  [layout] Clean up and document FlowLayout
  [layout] Snap children of FlowLayout to column/row
  ...

diff --cc .gitignore
Simple merge

diff --cc clutter/Makefile.am
Simple merge

diff --cc doc/reference/clutter/clutter-sections.txt
Simple merge

diff --cc tests/interactive/Makefile.am
Simple merge