Merge pull request #129 from fdelapena/master

Build fixes
Merge pull request #130 from fdelapena/master

Compiler an linker fixes for popular distros
improve package finding
Merge pull request #131 from take-cheeze/findlua

improve package finding
move FindExpat,FindIconv to readers and find zlib before png
Merge pull request #132 from take-cheeze/findiconv

move FindExpat,FindIconv to readers and find zlib before png
Fix Picture rotation.

Now picture rotates from center and in the correct direction.
Merge pull request #134 from MarianoGnu/image

Correct picture rotation