Merge branch 'master' into 2016-02-colorpicker

Merge various documentation tweaks, comments, todos from the Navigation Branch to reduce drift a little

Fixed GetScrollMaxX() debug left-over from 7096fd8 (#1271)

Merge remote-tracking branch 'origin' into 2016-02-colorpicker

Columns: First first column appearing wider than others (#1266)

SetScrollHere() tweak to make the code a little less confusing

Fixed Y scroll aiming when Horizontal Scrollbar is enabled (#665). Tweak log demo.

Fixes for Vertical Scrollbar not automatically getting enabled if enabled Horizontal Scrollbar straddle the vertical limit. (#1271, #246)

Fixed GetScrollMaxX(), GetScrollMaxY(). Tweak demo to display more data. Using functions in Begin(). (#1271)

Popups window can be moved (if they don't have explicit positions provided by user, or e.g. sub-menu popup) (#1252)

Comments, clarification about io.WantCaptureMouse, io.WantCaptureKeyboard flags timing and NewFrame(). (#1262)

Clipboard: [windows] Fixed not closing win32 clipboard on early return. (#1264)

DataTypeApplyOpFromText: renamed local variables + comments to avoid confusion about the fact that int and float paths are not totally symetrical. (#671)

ColorPicker: Hue wheel + SV triangle picker mode (mode selection flags still wip, missing context menu and persistent options). (#346)

Internals: Added ImLineClosestPoint, ImTriangleClosestPoint helpers. Changing ImVec2 arg to const ImVec2&

Internals: Added ImTriangleBarycentricCoords() helper. Renamed ImIsPointInTriangle() to ImTriangleContainsPoint(), with different arg order.

ColorEdit: Extract ColorOptionsPopup() function out of ColorEdit4(). (#346)

ColorPicker: Rearrange code to introduce alternate HSV picker/selector with simpler diff. (#346)

Comments, minor tidying up.

ColorPicker: Reordered drawing code to match left-to-right display. Extra comments. (#346)

Renamed ImGuiColorEditFlags_ModeMask_ to ImGuiColorEditFlags_InputsModeMask_ (#346)

ColorPicker4: Fixed forwarding _HDR flag from ColorPicker4 back to ColorEdit4 components. (#346)

ColorPicker: Alpha bar using a checkerboard. (#346)

ColorEdit4: Preliminary support for ImGuiColorEditFlags_HDR flag (currently only lift limits). (#346)

ColorEdit4: Hex input clamps integer components to 0..255 range during printout (#346)

ColorButton: Added frame border when style border are off. (#346) @jdumas

Renamed ImGuiColorEditFlags_NoColorSquare to ImGuiColorEditFlags_NoSmallPreview (#346)

ColorPicker: Honor ImGuiColorEditFlags_NoTooltip if for some reason user wants that. (#346)

ColorPicker: Better cursor/color preview over the color matrix. (#346)

ColorPicker4: hue/alpha bars draw arrows that would look right on all background. RenderArrow helper. (#346)