New log level added (LOG_WARN)
Minor change
better resolution handling (fixes #38)

- dpi computation moved to in dedicated function
- do not exit in case of resolution mismatch (fixes #38)
- comments improved
minor change
minor change
Automatic oversampling

- If resolution is too low (<250dpi) perform automatic oversampling of
the image
- comments improved
- log messages improved
Oversampling + more than 1 img

- Oversampling resolution can now be set from the cmd line (-o option)
- If a page contains more than one image, warn the user but process the
page anyway with a default resolution
Warn user in case of low resolution
Delete 2013_09_LED_und_Energiesparlampen.pdf

file committed by mistake... So deleting it now
Echo version of the used tools

Fixes #35
Support section added
echo also java version in debug mode
minor change
path to tmp folder now defined in config.sh
Check if page already contains a font
Minor change
copyright years updated
Support for -f option

Fixes #16
Echo arguments of script in debug mode
minor change