modules: datetime, time and numpy imported but not used
added --no-legend parameter to disable legend plotting. useful to remove company information.
option to run mongod/mongos process from local directory, by prefixing call with "./"
Merge pull request #7 from gianpaj/patch-1

modules: datetime, time and numpy imported but not used
re-written LogLine to evaluate information lazily for performance improvement.
can also detect date starting later in the log line.
mlogfilter now using LogLine extraction (#11). Also fixed milli second support (#9).
stop parsing for datetime after first 10 tokens to avoid parsing very long lines.
updated mlogmerge to work with new LogLine implementation.
renamed connection to thread (as in mongo code).
renamed connection to thread, fixed thread extraction, operation+namespace extraction does not depend on thread extraction anymore, just on datetime offset.
mplotqueries compatible to new LogLine extraction now.
added --color option to filter for different types of queries (#15).
Coloring choices: namespace (default), operation, thread.
enable/disable plots with 0-9, 0 toggles everything, 1-9 toggle plots 1-9 (#18).
improved help text for mplotqueries new --color option.
renamed --color option to --group for better consistency with the code.
Update README.md

added description for mplotqueries --group and keystrokes 0-9.
Update README.md

Clarified installation instructions.
added mplotqueries picture to README.
fixed small bug in logline, was accessing list element without knowing the size of the list.
Now, if you click somewhere, only the visible points return their logline. This fixes #20.