Mention register_error_handler in errorhandler doc

The documentation for @errorhandler gives "app.error_handler_spec[None][404] = page_not_found" as an example for adding an error handler without the decorator.  However, register_error_handler appears to be the correct way to do this (added 0.7), and it eliminates the problems with modifying error_handler_spec directly.
Update blueprints.rst - Error Handlers

Added information about custom error handlers in Blueprints with example based simple_page.
Update sessions.py

get_cookie_path: fix docstring
Add a non-decorator version of the error handler register function

The main application object has a register_error_handler function
which mirrors the decorator's functionality. According to the principle
of least surprise, make sure blueprints also have this convenience function.
Add tests for user-defined exceptions in blueprints
Fix test_no_error_swallowing

Path in assertion is now cross-platform.
Fix test_send_file_object

static/index.html now opens in binary mode, and therefore newline conversion does not take place.
Make the decorators attribute on View a tuple by default

To discourage accidental runtime modification applying to all views.
Merge branch 'master' of github.com:obeattie/flask
added missing import in sqlalchemy doc
add TEMPLATES_AUTO_RELOAD option to config
Update url_for documentation

Previous documentation referenced a non-existent property on the Flask
object called "build_error_handler".

This should actually reference Flask.url_build_error_handlers.
Escaped 'text' keyword in column name.
moved Table import to next code block
Update windows installation and other notes

Making allowance for new convenience of `get-pip.py` that automatically installs setuptools and pip together.

Stop recommending distribute, which has now been merged into setuptools.
Update json.py
Update sessions.py

missing backticks in docstring
Update signals.py
Update views.py
Update wrappers.py