Use quote for a list without computation.
The patch for `init-loader` is not needed anymore.
Use `ignore-errors` for `condition-case` with ignoring errors.
Too many spaces.
Simplify merging a package source definition.

A package source definition is now merged by simply calling
`el-get-package-def` with an overriding source.
`el-get-bundle-package-def` and `el-get-bundle-defined-p` now
ignore `el-get-sources` not to be affected by `.status.el`.
Add an optional parameter to enable byte compilation warnings.
Use `el-get-byte-compile-file`.
Invalidate byte-compiled initilization forms on updating a package.
Fix wrong documentation.