Fixed float placement for listing in interp.tex.
Merge pull request #44 from jfdm/fix/float-error

Fixed float placement for listing in interp.tex.
Initial separation of print and screen versions.
Isolated common imports out into separate file.
Bumped version number.
Moved imports into header files.
Updated to latest idrislang.sty
updated idrislang.sty
Moved custom style for screen out to screen header.
Modified .gitignore
Merge pull request #45 from jfdm/print-and-screen-versies

Print and screen versies
Made note about access modifier more explicit.
Merge pull request #46 from jfdm/improv/access-modifier

Made note about access modifier more explicit.
Bumped release number for version.
Merge pull request #47 from jfdm/release

Bumped release number for version.