Fix for issue 1876: noImplicitAny means make them explicite

[catull]

npm run build has the TypeScript compiler configured to not allow implicit any references.
A build fails currently with - see issue #1876.

npm run build

> [email protected] build angular-cli.git
> npm-run-all -c build:main build:packages


> [email protected] build:main angular-cli.git
> tsc -p addon/ng2

addon/ng2/commands/init.ts(58,9): error TS7005: Variable 'gitInit' implicitly has an 'any' type.
addon/ng2/commands/init.ts(66,9): error TS7005: Variable 'linkCli' implicitly has an 'any' type.
addon/ng2/commands/init.ts(75,9): error TS7005: Variable 'npmInstall' implicitly has an 'any' type.
addon/ng2/commands/init.ts(84,9): error TS7005: Variable 'bowerInstall' implicitly has an 'any' type.

This PR fixes the compilation errors.

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