fix(history): stricter check of base in HTML5

[eyedean]

Fixed a bug in getLocation of HTML5 History that would slice the path, even if it's just a string-prefix of the base. (e.g. for base=/a/ and path=/app it would turn it to /a/pp.)

With the fix, I replaced the string-prefix check (via path.indexOf(base) === 0) into, an OR of these two conditions:

• Either path === base (case insensitive, as it was)
• Or, the path starts with base as a directory (i.e. base plus at least a / after that), so path.indexOf(base+"/") === 0

I tested it locally in my own repo that had this problem, and the fix is effective. I also ran the npm test and it passed all the tests. I didn't find any example unit test is already testing custom base to add to it.

Thanks.

Fix #3555

[posva]

Thanks!

[posva]

Thanks!