Option to make profiling disabled by default

Add a configuration option to start profiler disabled. Check it value
to decide if profiling should be skipped for each page. Profiling can be
re-enabled by setting the query parameter pp=enable.
Changed configuration option to enable/disable profiling

Set Cofiguration.enabled to false to disable functionality, set it to true to
re-enable. Default value is true.
Correct stale link; prefer hyperlinks where appropriate
Merge pull request #23 from gkats/master

Option to make profiling disabled by default
Merge pull request #24 from chadoh/patch-1

Correct stale link; prefer hyperlinks where appropriate
Revert "Update railtie to install after known dependencies: https://github.com/SamSaffron/MiniProfiler/issues/131"
Broken on Rails 4
add more gc stats to gc profile, perform memory usage analysis
include more stats, reduce heap growth
Remove BOM
Merge pull request #32 from hph/master

Remove BOMs
feature: added option to set flamegraph sampling rate
Merge pull request #34 from elhu/flamegraph-sample-rate

Option to configure flamegraph sampling rate
Allow Rack::MiniProfiler.config.pre_authorize_cb to be set in the app's initializer.
Merge pull request #35 from fiedl/master

Allow Rack::MiniProfiler.config.pre_authorize_cb to be set in the app's initializer.
update lock for testing
remove crazy usage of eval
fix regression, share dialog bust
correct #uniq!
0.9.0.pre