moved print statements over to python3.x

Switiching amasssite to the 3.x standard is something that will progress soon
for now the only thing that has changed is that the print statement is now
the print function
Created a better parsing method for amassite metadata

Instead of comparing the first line exactly the first line is parsed via regex
and the resulting matches are then stripped of whitespace on the left and right
sides. The resulting value is then checked as metadata. Still case sensitive.

The functions inside of all tags are now also stripped of whitespace on the left
and right sides before being processed.

Fixes #3
Fixes #7

Signed-off-by: Asher Glick <asher.glick@gmail.com>
made the metadata tags case insensitive