Add appengine/gcloud/mustache dependencies.

pkg/mustache/test/spec/comments.json

+{"__ATTN__":"Do not edit this file; changes belong in the appropriate YAML file.","overview":"Comment tags represent content that should never appear in the resulting\noutput.\n\nThe tag's content may contain any substring (including newlines) EXCEPT the\nclosing delimiter.\n\nComment tags SHOULD be treated as standalone when appropriate.\n","tests":[{"name":"Inline","data":{},"expected":"1234567890","template":"12345{{! Comment Block! }}67890","desc":"Comment blocks should be removed from the template."},{"name":"Multiline","data":{},"expected":"1234567890\n","template":"12345{{!\n  This is a\n  multi-line comment...\n}}67890\n","desc":"Multiline comments should be permitted."},{"name":"Standalone","data":{},"expected":"Begin.\nEnd.\n","template":"Begin.\n{{! Comment Block! }}\nEnd.\n","desc":"All standalone comment lines should be removed."},{"name":"Indented Standalone","data":{},"expected":"Begin.\nEnd.\n","template":"Begin.\n  {{! Indented Comment Block! }}\nEnd.\n","desc":"All standalone comment lines should be removed."},{"name":"Standalone Line Endings","data":{},"expected":"|\r\n|","template":"|\r\n{{! Standalone Comment }}\r\n|","desc":"\"\\r\\n\" should be considered a newline for standalone tags."},{"name":"Standalone Without Previous Line","data":{},"expected":"!","template":"  {{! I'm Still Standalone }}\n!","desc":"Standalone tags should not require a newline to precede them."},{"name":"Standalone Without Newline","data":{},"expected":"!\n","template":"!\n  {{! I'm Still Standalone }}","desc":"Standalone tags should not require a newline to follow them."},{"name":"Multiline Standalone","data":{},"expected":"Begin.\nEnd.\n","template":"Begin.\n{{!\nSomething's going on here...\n}}\nEnd.\n","desc":"All standalone comment lines should be removed."},{"name":"Indented Multiline Standalone","data":{},"expected":"Begin.\nEnd.\n","template":"Begin.\n  {{!\n    Something's going on here...\n  }}\nEnd.\n","desc":"All standalone comment lines should be removed."},{"name":"Indented Inline","data":{},"expected":"  12 \n","template":"  12 {{! 34 }}\n","desc":"Inline comments should not strip whitespace"},{"name":"Surrounding Whitespace","data":{},"expected":"12345  67890","template":"12345 {{! Comment Block! }} 67890","desc":"Comment removal should preserve surrounding whitespace."}]}