It seems that we missed the backward compatibility support
for profiles in the existing folder.
This commit also fixes some specs to be idempotent
and work in a temporary directory which not always
seems to be the case.
This commit also brings the profile_spec.rb which seems
to be missing.
Extend the support for "X-Profile-Token: <token>" to have an additional
header that defines type of profile we are looking for, like:
X-Profile-Mode: execution
X-Profile-Mode: memory
