create & use xml_utils class
Merge pull request #153 from jgawor/utf8

Utility class for reading & writing XML files
refactor setting buildpack env. variables as a framework
Merge pull request #154 from jgawor/env_refactor

Refactor setting buildpack env. variables as a framework
Use API instead of calling external commands
Merge pull request #156 from jgawor/chmod

ty!
fix file expression for snaps
Merge pull request #157 from jgawor/snap_2

Fix Snaptrace template
test
test with app name
try another agent
try another agent2
try another agent3