issue2551029: Jinja2 template install error. Issue where template's config.ini not getting updated. Change do_install in admin.py to load config_ini.ini from template before writing tracker's config.ini. This generates an updated config file for the user on install preserving values required tomake tracker work. Added config_ini.ini files to jinja2 and responsive templates to set required values (template_engine and static_files; static_files resp.). Documented new file in doc/tracker_templates.txt and added tests for new admin.py code.

{
    "validthis": true,
    "laxcomma" : true,
    "laxbreak" : true,
    "browser"  : true,
    "eqnull"   : true,
    "debug"    : true,
    "devel"    : true,
    "boss"     : true,
    "expr"     : true,
    "asi"      : true
}