New Features

New functions for easier purpose configuration
User purposes: purpose-add-user-purposes, purpose-remove-user-purposes.
Extension purposes: purpose-add-extension-purposes, purpose-remove-extension-purposes
Added Purpose menu to the menu-bar

Enhancements

Purpose ships with preinstalled layouts
Subdirectory layouts contains preinstalled layouts. Customizable variable purpose-use-built-in-layouts controls if those layouts are available to the user (available by default).
purpose-window-with-purpose now takes optional frame argument
Defaults to the selected frame.

#79: nil buffer means other-buffer for some buffer switching commands
These commands are: purpose-switch-buffer, purpose-switch-buffer-other-window, purpose-pop-buffer and purpose-pop-buffer-same-window.
dislpay function returning fail means don’t display buffer at all
#80: added autoloads to some commands outside of window-purpose.el
fixed argument order for purpose--remove-suffix in Emacs 24.3 and 24.4
#95: loading layouts to show different buffers
purpose-set-window-layout places different buffers of the same purpose, if the layout has multiple windows with same purpose. Previously, all windows with the purpose would show the same buffer after loading a layout. This affects all layout-loading commands.