app_terminal.py:  Fixed a bug where you'd get a (harmless) exception logged when the Terminal application tried to initialize the convenience plugin since it didn't have any hooks (it's just JavaScript).
core/server.py:  `GateOneApp()` now uses `pkg_resources` to find an configure the base `static_url` (the path to stuff under the /static/ URL).
core/server.py:  The path to the HTML documentation inside `GateOneApp()` now uses `pkg_resources` just like everything else.
core/server.py:  `from gateone import GATEONE_DIR` has been removed.  Finally!  Getting close to making Gate One available via pypi (e.g. 'pip install gateone').
core/server.py:  `ApplicationWebSocket.send_js_or_css()` now takes a 'force' keyword argument that will synchronize the file regardless of the 'send_js' or 'send_css' global setting.  This should allow things like the Editor plugin to continue working (fully) if the server has been configured to not send JS/CSS.
Editor Plugin:  `get_editor_mode()` uses the new 'force' keyword argument with `send_js()`.
core/server.py:  `ApplicationWebSocket.wrap_and_send_js()` now uses the 'force' keyword argument with `send_js()` (since there's no way it would work if JS sending was disabled).
core/server.py:  `ApplicationWebSocket.send_extra()` now uses the 'force' keyword argument since it wouldn't work if sending JS/CSS were disabled.
core/configuration.py:  `combine_javascript()` now uses `pkg_resources` to find and retrieve JavaScript files.  Also added some helpful messages and made it so that the other .js files in Gate One's main 'static' dir get included (apparently it was skipping them before this change!).
core/configuration.py:  `combine_css()` now uses `pkg_resources` just like `combine_javascript()`.  It also now includes plugin theme files (which it wasn't using previously).
app_terminal.py:  The `TerminalApplication.render_256_colors()` method has been modified to use the airplane symbol in 256-color classes.
256_colors.css:  Removed the hard-coded '#gateone' id and modified the 256-color classes to use the airplane symbol.