debug
warn -> error
address Ole's comments
Merge branch 'devel' into fix/invalid_plugins
make pymongo and nose optional dependencies
allow wildcard expansion on dict merge; add dict_merge example (app config)
example update
add missing import
reformat debug prints
Merge branch 'devel' into fix/invalid_plugins
small iteration on setup.py
use logging in lease manager
resilience against failing object creation in lease manager
change log level
add DebugHelper object.

That object installs a signal handler for SIGUSR1 on creation, which, when invoked, will dump the stack traces for all threads.  So any application which owns such an instance in any thread can be signalled for a current stack trace to stdout.
only install signal handler on RADICAL_DEBUG
SIGUSR1 -> SIGINFO for debug helper
Draft of lease timouts
SIGUSR1 -> SIGINFO for debug helper
Merge branch 'devel' of github.com:radical-cybertools/radical.utils into devel
add support for method timing