ida-story [3]launcher now can continue on error

compute launcher now accepts option --continue_on_error.
if the option is not provided it will stop on first runtime exception by
default.
I have also pulled exceotion handling to top layer(launch) as part of
this PR.
got rid of unnecessary instance variable
fixed indentation in vapp_orchestrator
removed not so useful test

this behavior is now being tested in launch_spec.rb
making launcher logging better

- added spacing between log msges for vapps.making them more readable
- added logging after a vapp is succefully provisioned. this was missing
fixing cucumber
Add #process_task to VSE example code

Per the gists linked. Rather than duplicating it in each example.
Merge pull request #98 from alphagov/continue_on_error_option

Continue on error option
Internalise two of the VSE examples

Rather than linking out to personal gists. Because Sneha may not keep them
forever, and they should be version controlled here.

The NAT example is missing because GitHub currenlty returns:
```
Hm.

This gist can't be viewed at the moment. Please send a message to Support and we'll have a look as soon as we can.
```

@snehaso, do you have another copy of this?
Merge pull request #99 from alphagov/vse_doc_examples

Internalise two of the VSE examples
nat configuration example
Merge pull request #100 from alphagov/documenting_nat_example

documenting nat configuration for VSE
making cli options unixy
Move query to core
Clarify how `FOG_CREDENTIAL` env var is used

This commit clarifies how the FOG_CREDENTIAL env var is used, providing examples of a .fog file and an example command.
Merge pull request #104 from alphagov/fog-creds-env-var

Clarify how `FOG_CREDENTIAL` env var is used
methadone-magic  got rid of cli option starting with --no

methadone magic :
If you provide a cli option --abc, methadone converts it to {:abc =>
true, "abc" => true}.
Only for cli options starting with 'no', it returns a false value. e.g
--no-power-on => {:"no-power-on" => false, "no-power-on" => false}. This
reads wrong in code.
Merge pull request #101 from alphagov/making_cli_options_unixy

[#63524350] making cli options unixy
Merge pull request #102 from alphagov/move-query-to-core

[#62889914] Move query to core
Clarify Fog env var in README.md