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Merge pull request #59 from zenorocha/patch-1

Use SVG badge for Travis
Add generator and subgenerator USAGE files
Style the code blocks a little bit.
Merge pull request #60 from corburn/usage

Add generator and subgenerator USAGE files
Add a warning if package name already exists on npm
Merge pull request #64 from zenorocha/pkg-name

Check if name already exists on npm
Use inquirer's 'when' instead of 'filter' to check if a package name is available on npm
Merge pull request #67 from zenorocha/when-pkg-name

Use inquirer's 'when' instead of 'filter' to check if a package name is available on npm
incorporate yosay.
Merge pull request #68 from stephenplusplus/master

incorporate yosay.
0.4.4
Authenticate using GitHub API token if available

Querying GitHub API anonymously has low limits which can make people
run into errors. This commit authenticates itself using a GitHub API
token if one is provided in the GITHUB_TOKEN environmental variable.

Fixes #56