{file, parser}: enforce default section name to lowercase with insent…

…ive load (go-ini#125)

Bump version

struct: only return error in strict mode

struct: support reflect/map comment tag

Closes go-ini#113

file: add load option UnescapeValueDoubleQuotes

Closes go-ini#110

Update .travis.yml

struct: detect regular struct that is not time.Time (go-ini#108)

struct: add strict mode to MapTo series (go-ini#96)

struct: remove skipping 0 value for int types (go-ini#103)

ini: do not outout back quotes if IgnoreInlineComment enabled (go-ini#99

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