[md-paginator] pageSize keeps default of 50 even if pageSizeOptions only has 1 option which is not 50

[Lior-G]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

if there is only 1 option set in pageSizeOptions, it should overwrite the default

What is the current behavior?

default is 50 even if it does not exist in pageSizeOptions

What are the steps to reproduce?

<md-paginator
[length]="100"
[pageSizeOptions]="[10]">

What is the use-case or motivation for changing an existing behavior?

simplify code of user only needs/wants 1 page size

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

"@angular/core": "4.2.6",
"@angular/cdk: 2.0.0-beta.8",
"@angular/material": "^2.0.0-beta.8",

"@angular/cli": "1.2.0",
"@angular/compiler-cli": "4.2.6",

Is there anything else we should know?

[jelbourn]

@andrewseguin couple of things:

• We should hide the select if there's only one option
• We should default the initial page size to one of the options if options are provided that don't match the default page size

[ghost]

how i can get the next or prev button click event ??

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