[SPARK-11108][ML] OneHotEncoder should support other numeric types

[sethah]

Adding support for other numeric types:

• Integer
• Short
• Long
• Float
• Decimal

[SparkQA]

Test build #46112 has finished for PR 9777 at commit 7a6fec1.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #46111 has finished for PR 9777 at commit 0fd4a91.

• This patch passes all tests.
• This patch does not merge cleanly.
• This patch adds no public classes.

[frreiss]

values *in column

[sethah]

I reverted this back to the original wording, "Values from column".

[frreiss]

LGTM aside from that one typo

[SparkQA]

Test build #52675 has finished for PR 9777 at commit c60803e.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #52680 has finished for PR 9777 at commit 1a486f8.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #52684 has finished for PR 9777 at commit 1c9b9cd.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[MLnick]

LGTM merged into master. Thanks!