analysis range: clean up the to_s parts

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
model: adds var support to AInputInstruction

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
analysis range: extended to support inputs and .bytes

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
analysis framework: allows nullable values in framework

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
analysis range: updates with nulls

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
analysis framework: improves the performances of the framework

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
analysis reaching feds: updated to use nulls

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
analysis range: fix call

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
analysis types: updated to use nulls

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: use a .WORD in tests/laf/range.pep

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
Merge branch 'master' of http://github.com/xymus/pep8analysis