Remove duplicate -H, --no-header-row entry

Assuming this was accidental and not necessary for some reason.
Add "python setup.py develop" to developer install steps.

Without it you can run tests but can't interactively use the shell utilities. Makes it quite hard to start debugging!
Fix csvsqlite choking on STDIN, with test.

Curently running `echo -e "a,b,c\n1,2,3" | csvsql` gives this error:

    TypeError: object of type 'cStringIO.StringI' has no len()

This patch fixes it, as well as adds a test case that mocks STDIN.
The error was introduced by pull request #193
Strip trailing spaces from tests/test_utilities/test_csvsql.py
Added Alex Dergachev to AUTHORS file
Merge pull request #234 from dergachev/improve-dev-instructions

Add "python setup.py develop" to developer install steps.
Add Alex Dergachev to AUTHORS.
Merge pull request #235 from dergachev/fix-csvsqlite-stdin

Fix csvsqlite choking on STDIN
Merge pull request #232 from JeffPaine/patch-1

Minor typo fix
Add Jeff Paine to AUTHORS.