Fix a race against querying the ETS/DETS tables.

There is a window from the query of, say, `ets:all()` to the point where we fetch out the table data. The table may disappear in between. This patch fixes this problem by ignoring such tables and returning the empty list for those where there is no data available anymore.
Fix histogram of type 'none'

* Before, after filling in the SIZE of the histogram, when adding new values the same element was deleted and updated all the time.
* Tests are included.
Merge pull request #61 from Lastres/fix_none_histogram

Fix histogram of type 'none'
Add histogram of type 'slide_sorted'

* This histogram is a simple sliding window of fixed size.
* Tests included.
Merge pull request #63 from Lastres/slide_sorted_histogram

Add histogram of type 'slide_sorted'
use meck 0.7.2
Add bear to start applications
add tuple default for slide_uniform
Merge pull request #65 from ypaq/master

use meck 0.7.2
Merge pull request #68 from tagged/slide_uniform_default

add tuple default for slide_uniform
Merge pull request #67 from puzza007/bear-in-start-applications

Add bear to start applications
Add .mailmap to clean up the output of `git shortlog -nes`
Add ability to pass tags to notify
Merge pull request #70 from avasenin/tagged-notify

Add ability to pass tags to notify
Merge pull request #69 from rodo/master

Add .mailmap to clean up the output of `git shortlog -nes`
Merge pull request #59 from jlouis/fix-ets-dets-race

Fix a race against querying the ETS/DETS tables.
Revert "Add bear to start applications"

This reverts commit d46722d9d28920e624cb4f1401ba3b9e920ef5fc.
switch strings to atoms in vm metrics
wrap erlang:statistics and get_system_info to avoid issues on new/old vms
clean up superfluous brackets