Support using `http_set_header` and `http_remove_header` as blocks

Example:

```ruby
http_set_header "Authorization", "Bearer 12345.."
http_remove_header "Authorization" do
  http_get "/api/users", status: 403
end

http_get "/api/users", status: 200
```

Signed-off-by: Aravinda VK <[email protected]>

Fix the multipart upload issues and local command run issues (#42)

Signed-off-by: Aravinda VK <[email protected]>

Make base URL optional for ReST API plugin (#41)

- Each sub commands `http_get/http_post/http_put/http_delete` accepts
  full URLs
- Renamed commands and added plugin prefix to many commands
- Updated the docs

Signed-off-by: Aravinda VK <[email protected]>

Rubocop reported fixes

Signed-off-by: Aravinda VK <[email protected]>

Fix the Release script and version (#38)

Signed-off-by: Aravinda VK <[email protected]>

Add Line number in Test result (#34)

Signed-off-by: Aravinda Vishwanathapura <[email protected]>

Add support for Verbose level (#33)

- `-v`  Show debug info and each test output
- `-vv` Show STDOUT from each test execution

Signed-off-by: Aravinda Vishwanathapura <[email protected]>

Show the list of failed tests in the end (#32)

Fixes: #31
Signed-off-by: Aravinda Vishwanathapura <[email protected]>

Fix issue while showing the diagnostic message of EXPECT and EQUAL (#29)

Signed-off-by: Aravinda Vishwanathapura <[email protected]>

Remove new line before each Testcase (#28)

Signed-off-by: Aravinda Vishwanathapura <[email protected]>