Documentation: how to install under OSGeo4W
removed old referece to API docs from developer docs
update tox.ini to point to new mapproxy.org server
update docs rsync command
bumped version for next (dev) releases
log removing tiles messages in seed cleanup with time
Merge branch '1.5.x'
make template directory configurable

useful for deployments where code needs to be separated from other files
fix rounding errors in bbox_position_in_image

use integers when calculating offsets (will be converted to int
later anyways) to get the size calculation right.

closes #48
Merge branch '1.5.x'
add merge to ImageOptions
add merge_method to config
enable composite image merging
always use global image options
check for alpha_composite support
disable alpha composite test when Image.alpha_composite is not available
raise nose.plugins.skip.SkipTest when Image.alpha_composite is not available
improve tile origin handling

- always use origin ll or ul inside of TileGrid (no sw/nw/None)
- improve supports_access_with_origin with custom  grids

closes #51
Merge branch '1.5.x'
fix for rounding issues on python 2.5/2.6