optimize flamegraph generation for allocations
add viewer
fix callgrind report
Fix buffer overflow in stackprof_record_sample()
Merge pull request #19 from csfrancis/record_sample_buffer_overflow

Fix buffer overflow in stackprof_record_sample()
v0.2.6
Pass Qnil to rb_tracepoint_new
Merge pull request #20 from csfrancis/tracepoint_new_qnil

Pass Qnil to rb_tracepoint_new
Allow the use of a Proc to decide if the middleware is enabled
Avoid possibly inconsistent state
Allow Middleware.enabled to override the mode