added dynamic find_by_ATTRIBUTE_NAME conveniance methods to PoW Models

so you can now use find_by_firstname or find_by_lastname if your
model/table has attributes firstname, lastname. Automatically generated
on model init() so it will also cover changes while removing or adding
new Attributes.
added two images for documentation of htp call handling and software stack

will be used for the PoW  ducumentation page
DRYed generate_app, cleaned basemodel_stub, optimized hero.™pl

tested with blog and simple server, works
added the basic functionality for package building

find the MANIFEST.in, setup.py README and Changes in the scripts/package
directory.
more restructuring and adaptions to produce a pip package

now works almost completely except for imports after package install.
Adapted the file extension for the stubs, install_requirements work as
well as script installations into <python> folder. also shebang
replacement works fine
some tests towarda uthentication added .. work in progress
short adaption to the tests (only to document a change)
added markdown test
now we can paginate safely
make PoW WSGI proxy safe

by forcing no-caching by default. Testing showed problems with session
management otherwise.
need to copy generate_app.py back to the root since package still has some issues

sdist now works and scripts are placed in site-packages as well, when
running pip install pythononwheels. BUT some imports dont work .. still
fixing but with the re-copied generate_app one can build applications in
the local dir again. Just a temp-fix.
tested, fixed and fine tuned generate_migration

functionality now ok, code style must be reviewed.
added an option to set a template manually for scaffolding

example:
python generate_scaffold.py post -f -t blog.tmpl
improved paginator, pow_console and replaced eval with getattr
added a pretty handy generate_mvc

generates model, views, controller and accoring migration in a row.
small adaptions to create_link and two view stubs
closed issue #11 cleaned the controller actions

see: https://github.com/pythononwheels/pow_devel/issues/11
closed issue #15 and quick bugfix for controller.delete

did that already some days before but didn't close the issue …. see:
https://github.com/pythononwheels/pow_devel/issues/15
smaller changes to pow_web_lib (function names changed ..)

Basemodel cahnges will be overwritten soon, since there I am currentlx
comlpetely rebuilding the model/sqlalchemy interface.
merged atest and this branch first shot