Update to support more regions

Relates https://github.com/hashicorp/terraform/issues/524
Added `eu-central-1`, `cn-north-1` and `us-gove-west-1`(hi NSA)
I checked `goamz`, @mitchellh already has added support for those regions
Do not read temporary editor files, fixes #548

This fixes a bug where Terraform would error with the following:

```
Error loading config: Error reading
/Users/rhenrichs/work/example/.#example.tf: open
/Users/rhenrichs/work/example/.#example.tf: no such file or directory
```

The solution implemented here ignores the common emacs and vim
temporary file formats.

Note: the potential danger with merging this is that Terraform could
quickly have requests to ignore other file formats.
Fixed a type and reordered the case statements

Making in more inline with the existing code…
Merge pull request #675 from svanharmelen/f-fix-typo/style

Fixed a type and reordered the case statements
Looking at issue #639 this seems to be the root cause

After fixing this part, there also needs to be made a change to the
example given or the schema of aws_elb.
Merge pull request #632 from KushalP/master

config: do not read temporary editor files, fixes #548
update CHANGELOG
up version for dev
Fixing the flipflop problem

Actually meant as a PoC, but it works perfectly so let’s just merge
this…
Finishing up the needed changes

Also executed the acceptance tests successfully now.
Merge pull request #525 from pmoust/patch-2

provider/aws: update to support more regions
Update CHANGELOG
config: validate that module variables can go to ints, convert [GH-624]
Merge pull request #679 from hashicorp/b-fix-module=type

config: validate that module variables can go to ints, convert [GH-624]
Update CHANGELOG
Merge pull request #676 from svanharmelen/f-fix-expand-bug

core: fix expand bug
Updated the code so it makes use of the available functionality

The `helper/schema` package already knows how to create a set from a
slice with set items. So let’s use that functionality…
Merge pull request #677 from svanharmelen/f-provider-aws-fix-route53-toggling

provider/aws: fixing the flipflop problem for the aws_route53 resource