Fix ContainerParams.txt filename:

  This file path is referenced as configParams/ContainerParams.txt in
the Thorfile but the real filename is containerParams.txt so build can't
be done:

$ thor build:dev my
:: Deleting other development files...
:: Building full source file /dist/kinetic-vmy.js...
$PWD/Thorfile:153:in `read': No such file or directory - \
  configParams/ContainerParams.txt (Errno::ENOENT)

  It was fixed in 04ddd321 by changing the path in the Thorfile, but
broken by 912cef43.

  This change rename the file with the correct name.
Merge pull request #381 from tjouan/container_params-filename-fix

Fix ContainerParams.txt filename