properly use with left and right span of an element for the surrounding box instead of the available size

Ignore-this: 7856b31d312588b86b6cd9512c96840

darcs-hash:20140901194544-fae1a-7ea30ba9c61a8957abd2e2b12ce1812bff7a6533
fix a warning

Ignore-this: b1d84238202f1f9c3fdfad8389683752

darcs-hash:20140901194749-fae1a-960cc0ecf01a39eaa9e5eeaf8701ffc24a893d61
implement image tag support for the HTML parser (only in-flow images for the moment)

Ignore-this: b02abd2ba58d9509f431d12db7448f20

darcs-hash:20140907183334-fae1a-a538aa58c8d63f240890c1ec21b8291c85c6f101
update test program with some images

Ignore-this: 8b61938e8b2f173bddfb10369117a57

darcs-hash:20140907183957-fae1a-83615511eaa2bafe6327da003e62982405754982